June 1994

Virtual Reality (full article)

42 min

A sixty year-old grandmother sits astride a Honda Interceptor, motoring at eighty miles-per-hour over wild, treacherous terrain, the wind whipping her face and hair, the heat of the noonday sun on her back, feeling the g-forces as she and her Interceptor lurch through hairpin turns and barely miss countless trees and rock formations. Finally, she fails to negotiate one last turn and flies out into a canyon. In mid-air, if she has not fainted, she contemplates whether it was foolhardy to attempt such a ride, and tries to fathom how much mental suffering is experienced by looking down at the canyon floor and confronting death.

The grandmother is a member of a jury, and she is not actually on a motorcycle, but merely the audience in a presentation of evidence that makes use of what would be a rather advanced form of a new communications medium termed "virtual reality."

It would be a strange sight, with the law looking more like Buck Rogers than Perry Mason -- six to twelve jurors outfitted in special high-tech goggles, headphones, and body suits, perhaps sitting upon simulators in a special room complete with wind and heat or cold. The participants would view three-dimensional films or computer-generated simulations close-up through special goggles, listen to stereo sound that accompanies the film, and wear special body suits that selectively adjust temperature and pressure to create the sensation of actually being in the movie that they are watching.

The use of virtual reality will become increasingly popular as attorneys become more familiar with the medium and the means by which it can properly be admitted into evidence. The key to admissibility will be establishing that virtual reality evidence adds to the body of relevant information enabling a jury to reach an informed verdict, and showing that the probative value of the added information outweighs possible confusion or prejudicial effect. In determining whether this test has been met, the trial court will be granted broad discretion. Due to the powerful effect of such evidence, the manner in which a given court exercises its discretion can be predicted to have a dramatic effect on both the settlement value and the ultimate outcome of a case.

In Stephenson v. Honda Motors Ltd. of America, Cal. Super. Case No. 81067 [date], the first case to admit virtual reality evidence, attorney Dennis Seley of the Sacramento law firm of McKenroth, Seley & Ryan convinced a California Superior Court of the need to use the visual component of virtual reality to help a jury understand the nature of the terrain over which an accident victim chose to drive her Honda motorcycle. Honda and Seley argued that the terrain was obviously too treacherous for the safe operation of a motorcycle, and that, while two-dimensional photographs and videos would help provide the jury with some idea of what the terrain was like, a three-dimensional view was much more realistic. In allowing the evidence, the court determined that the three-dimensional view was more informative, relevant, and probative.

Several questions are raised by the prospect of introducing virtual reality evidence. First, it must be determined which legal tests should be applied to determine whether in a given case virtual reality evidence should be admitted. In some respects, without the additional components of temperature, pressure, wind, and the like, virtual reality is nothing more than a very sophisticated video with sound. In other respects, it is like a jury view, although one which the court and counsel can control much more easily than an actual jury view. Finally, some may argue, perhaps erroneously, that virtual reality is analogous to novel scientific evidence and should be subjected to the Daubert test. The ultimate question that must be answered is whether the virtual reality evidence is so persuasive and realistic as to create a potential for undue prejudice or confusion that is not present with photographs or sound recordings, and whether this potential outweighs the probative value of the virtual reality evidence. Indeed, the opportunity to prejudice the trier of fact is the very reason virtual reality evidence will be offered in lieu of more traditional forms of evidence.

While one's initial reaction to virtual reality in its most advanced form might be that virtual reality is something akin to Buck Rogers or Star Trek, it is perhaps most accurate to recognize virtual reality as merely a compilation of several methods of presentation, two of which are already used often in courtrooms. In essence, virtual reality is a three- dimensional motion picture with stereo sound, along with a body suit that applies temperature and pressure. Wind and wetness might also be provided, along with such things as body orientation or g-forces. Of course, not all of these elements need be provided, and if a court objects to the more unusual elements, it could be argued that a court should still permit the use of the three-dimensional motion picture and stereo sound. In that instance, the only difference between the use of virtual reality and ordinary videotapes with sound would be the three-dimensional nature of the motion picture and the fact that the sights and sounds might occupy the entirety of the juror's visual field and hearing. In the event that the three-dimensional effect is accomplished with a special image on a video screen sitting in the middle of the courtroom, so that the jury is looking through its goggles across the courtroom rather than having the image projected into the goggles, the dissimilarities between virtual reality and ordinary video become even further diminished.

However, on a fundamental level, what may set virtual reality apart from more traditional forms of evidence would be its effort to place a juror in the position of directly experiencing the subject of the presentation. Because the virtual reality presentation is more realistic, the juror may consciously or subconsciously view the subject of the presentation from the perspective of experiencing it herself, rather than forming a more objective analysis of what it meant for the relevant party to experience it. As a result, there may be a greater potential for arousing the juror's biases and prejudices with regard to the subject of the presentation. For example, a juror made to endure the simulated experience of a motorcycle ride over rough terrain may start to think of the experience in terms of whether the juror would attempt it, rather than considering whether the course would be suitable for the relevant party, with that person's experience and temperament and reflexes.

This article will examine some of the rules applied in determining the admissibility of other types of evidence, discuss the similarities and differences between virtual reality and other types of evidence, and analyze how virtual reality evidence might be treated by courts asked to permit its use in presenting evidence to a jury.

I. Traditional Evidentiary Tests

A. General Rules

The general and most basic rules applied to all forms of evidence in the federal courts, and in most state courts, are found in Rules 401-403 of the Federal Rules of Evidence. To be admissible, evidence must be relevant, Fed. R. Evid. 402, with relevance defined as the "tendency to make the existence of any fact that is of consequence to the determination of the action more probable or less probable than it would be without the evidence." Fed. R. Evid. 401. Secondly, the probative value of the evidence must outweigh the potential for creating prejudice or confusion. Rule 403 reads:

Although relevant, evidence may be excluded if its probative value is substantially outweighed by the danger of unfair prejudice, confusion of the issues, or misleading the jury, or by considerations of undue delay, waste of time, or needless presentation of cumulative evidence.

Fed. R. Evid. 403.

In determining whether evidence is admissible under Rules 402 and 403, a trial court is granted broad discretion, and generally will not be overturned absent a showing of a clear abuse of discretion, or a finding that a court's holding was clearly erroneous. Four Corners Helicopters, Inc. v. Turbomeca, S.A., 979 F.2d 1434, 1441 (10th Cir. 1992)("'A trial court's evidentiary rulings are reviewed for an abuse of discretion[].'"), quoting Durtsche v. American Colloid Co., 958 F.2d 1007, 1011 (10th Cir. 1992); Bissett v. Burlington Northern R. Co., 969 F.2d 727 (8th Cir. 1992) (videotaped re-enactment; Trial court has a "'large amount of discretion over the admissibility of evidence in [Federal Employer Liability Act] cases.'"), quoting Paul v. Missouri Pac. R.R. Co., 963 F.2d 1058, 1061-62 (8th Cir. 1992), quoting Naylor v. St. Louis S.W. R.R. Co., 847 F.2d 1305, 1307 (8th Cir. 1988); Williams v. Butler, 746 F.2d 431, 440 (8th Cir. 1984),aff'd on reh'g, 762 F.2d 73 (1985), vacated mem., City of Little Rock v. Williams, 475 U.S. 1105 (1986) (Requiring "clear" abuse of discretion to overturn trial court's determination of evidentiary admissibility), citing United States v. Jones, 687 F.2d 1265, 1267 (8th Cir. 1982), quoting United States v. Brown, 482 F.2d 1226 (8th Cir. 1973).

B. Traditional Evidentiary Tests

In many ways, virtual reality evidence is merely a compilation of other forms of evidence already admitted in appropriate circumstances. Courts already admit videos and sound recordings, or other demonstrative forms of evidence, and sometimes permit the use of re-enactments or experiments, or a jury view. Some of the factors considered in determining whether to admit or exclude some of these other types of evidence will be relevant to the determination of whether to admit or exclude virtual reality evidence.

1. Photographs

Under the Federal Rules of Evidence, photographs are generally admissible, if a proper foundation is established. Navarro de Cosme v. Hospital Pavia, 922 F.2d 926, 931 (1st Cir. 1991). However, photographs may be excluded, as is the case with all forms of evidence, "if their 'probative value is substantially outweighed by the danger of unfair prejudice, confusion of the issues, or misleading the jury, or by considerations of undue delay, waste of time, or needless presentation of cumulative evidence.'" Navarro de Cosme, 922 F.2d at 931, quoting Fed. R. Evid. 403.

In determining whether to admit or exclude photographic evidence, as with other similar media, the focus is not simply upon the contents of the photographs, and the information they convey, but upon the method of presentation and the impact it may have. For example, in Navarro de Cosme, certain photographs depicted a stillborn infant. The plaintiffs wished to admit the photographs to show that death was not caused by an umbilical cord being wrapped around the neck of the infant when it was in utero. The First Circuit pointed out that the same information was communicated in a different manner, by having two experts testify that death was not caused by the umbilical cord, and refused to reverse the trial court's discretionary decision to exclude the photographs because the actual sight of the stillborn infant, already beginning to decompose, could have inflamed the jury, such that their prejudicial impact could have outweighed their probative value. 922 F.2d at 930-31. The trial court stated:

"The photos are gruesome. The photos are, in my own estimation ... insensible [and] I will not admit them in this Court.... [I]f I live to be 90 years old I will never forget these photos. And I am not going to show them to the jury."

922 F.2d at 931, quoting trial transcript.

Similar arguments can be anticipated with regard to virtual reality.

2. Sound Recordings

Virtual reality which would truly place a jury "on the scene" would include stereo sound. However, it would have to be established that the sound was relevant for it to be admitted in a given case.

Sound recordings are generally admissible if they meet criteria relating to accuracy and reliability. Whether the recording must be a good simulation of the actual sound that was recorded depends upon the purpose for which the sound recording is offered, and its potential impact on the jury with regard to their treatment of issues relevant to the case.

The Eighth Circuit set out a laundry list of requirements for sound recordings in United States v. McMillan. 508 F.2d 101 (8th Cir.), cert. denied, 421 U.S. 916, 95 S. Ct. 1577, 43 L. Ed. 2d 782 (1975). When offering sound recordings of conversations, proponents must establish that: (1) the recording device was capable of taking[sic] the conversation; (2) the operator of the device was competent to operate it; (3) the recording was authentic and correct; (4) no changes, deletions, or alterations were made to the recording; (5) the recording was preserved in a manner which was shown to the court; (6) the speakers are identified; and (7) the conversation elicited was made voluntarily, in good faith, and without any kind of inducement.United States v. McMillan, 508 F.2d at 104. The fact that the tape recording was successfully made is sufficient to establish the competence of the operator of the recording device, and oral testimony by a police officer who monitored the recording that the recording and an accompanying transcript accurately reflect the recorded conversation, along with testimony establishing the identity of the speakers, are enough to authenticate a tape recording. Williams v. Butler, 746 F.2d 431, 441 (8th Cir. 1984),aff'd on reh'g, 762 F.2d 73 (1985), vacated, City of Little Rock v. Williams, 475 U.S. 1105 (1986), citing United States v. Panas, 738 F.2d 278, 286 (8th Cir. 1984); see also United States v. Gordon, 688 F.2d 42, 44 (8th Cir. 1982).

Ultimately, the McMillan criteria essentially revolve around the basic characteristics required of demonstrative evidence generally--that it be accurate and reliable. Whether a sound recording must accurately simulate the sounds recorded, however, depends largely on the purpose for which the recording is offered and the type of relevant information that is to be presented to the jury.

In Williams v. Butler, for example, the purpose of the sound recording was to help substantiate the contents of the relevant conversation, not necessarily to perfectly simulate the sensation of being present at the conversation. In fact, the recording in Williams v. Butler was of a very poor quality, and some portions of the recording were actually inaudible. 746 F.2d at 441-42. Nonetheless, the Eighth Circuit declined to reverse the district court, and set out a test for determining whether poor sound quality is grounds for exclusion of a sound recording:

"The task of the trial court, in determining whether to admit tape recordings into evidence which contain inaudible portions, is to assess whether the unintelligible portions are 'so substantial in view of the purpose for which the tapes are offered as to render the recording as a whole untrustworthy.'"

746 F.2d at 442, quoting United States v. Bell, 651 F.2d 1255, 1259 (8th Cir. 1981), quoting United States v. Young, 488 F.2d 1211, 1214 (8th Cir. 1973). In Williams v. Butler, the Eighth Circuit held that the trial court did not abuse its discretion in admitting the tape into evidence because the inaudible portions were "not so substantial that they render[ed] the recording, as a whole, untrustworthy." Williams v. Butler, 746 F.2d at 442.

Furthermore, it was permissible in Williams v. Butler to modify a sound recording electronically to reduce sound interference. 746 F.2d at 441. As a result, under Williams, a sound recording need not always be a perfect simulation of the actual sounds being recorded. The sounds can be partly inaudible, and of a generally poor sound quality, and changes may be made to the recording to "clean up" the recording with noise reduction and other similar techniques.

In contrast, in Abernathy v. Superior-Hardwoods, the actual quality and intensity of sound was relevant to a key issue in the case, and the trial court excluded the soundtrack portion of a videotape when it could not be established that the soundtrack accurately simulated the sounds of the subject of the videotape. 704 F.2d 963, 968 (7th Cir. 1983).

In Abernathy, the plaintiff was injured by a forklift unloading logs from a truck at a sawmill. The defendant argued that the plaintiff should have heard the noise of the forklift and gotten out of the way. When the defendant sought to admit a videotape depicting the general method in which trucks were unloaded at the sawmill, the court required that the video be played with its sound turned off, presumably to prevent jurors from drawing conclusions about whether the plaintiff should have heard the sound of the forklift.

The Seventh Circuit upheld the exclusion on the grounds that the soundtrack of the videotape would not accurately depict the sounds of the forklift as they would have been heard by the plaintiff. 704 F.2d at 968. The Seventh Circuit stated:

[T]o be admissible -- at least as a matter of law, rather than in the trial judge's discretion -- the recording must, of course, meet minimum standards of reliability. E.g., Renfro Hosiery Mills Co. v. National Cash Register Co., 552 F.2d 1061, 1065-66 (4th Cir. 1977); Brandt v. French, 638 F.2d 209, 212 (10th Cir. 1981). This one did not. The microphone was not placed where Abernathy had been standing when he was hit by the log, though it easily could have been; the recording was made by an amateur, using amateur's equipment; and there is no indication that in the courtroom the video recorder's volume control would have been adjusted to produce the same decibel level as the sounds actually recorded.

704 F.2d at 968.

The concerns raised in Abernathy could take on special significance in the context of virtual reality evidence if the point of virtual reality evidence is to make the jury feel and see and hear exactly what it was like to be at a certain place involved with a certain activity. This end is not achieved if sounds are louder or softer or of a different quality than the actual sounds meant to be depicted. For example, sounds which are made louder or more threatening by the process of reproducing them for virtual reality might frighten a juror more than the original sound. A snowmobile ride might seem more dangerous because the roar of the engine, the roar of the wind, and the sound of the runners on the snow is louder than it is in reality or takes on a tone quality which a juror finds more piercing or menacing than the actual sound in the real world. To consider the difference in perception that would be created, one need only think of the difference between watching a movie like Aliens 2 on a monophonic television and watching it in a theater with giant speakers blasting out the sounds of the aliens and their movements in high-fidelity Dolby multiphonic sound.

It is not difficult to imagine circumstances in which the exact volume and quality of sound is relevant. One instance, of course, is a situation like that in Abernathy in which sound might have provided a warning and been relevant to comparative negligence issues. Another scenario in which sound might be relevant is in determining pain and suffering damages in a tort case, if sound was part of the overall experience of the tort victim and added to mental suffering, for example, if the plaintiff heard the cries of dying passengers or the sound of a plane hitting the water. Even when a recording from a wiretap is admitted, the quality of sound might be relevant to an identification of a person's voice.

3. Motion Pictures

The test applied to determine whether to admit a videotape is generally no different than the tests applied to other types of evidence. The court must determine, in its discretion, whether the evidence presented by the videotape is relevant, and whether there is a likelihood that the videotape will have a confusing, misleading, or prejudicial impact, that will outweigh the probative value of the evidence.Hurt v. Coyne Cylinder Co., 956 F.2d 1319, 1328 (6th Cir. 1992); LeBoeuf v. K-Mart Corp., 888 F.2d 330, 334 (5th Cir. 1989).

At least in the Sixth Circuit, if a trial court excludes a videotape, in order for its proponent to obtain a reversal, she must provide a "compelling" reason why the video should be admitted, or why an abuse of discretion occurred.See Hurt v. Coyne Cylinder Co., 956 F.2d at 1328. In addition, as discussed above with regard to photographs, one should consider what relevant information is added by presenting evidence in videotape form. If the same information as is presented by the videotape is permitted in some other form, such as by oral testimony, this fact may provide an additional reason for an appellate court not to find that an abuse of discretion occurred when the district court excluded the videotape. For example, in Swajian v. General Motors Corp., the First Circuit pointed out that, while the district court excluded a videotape of a crash test, the district court did permit oral testimony about the crash. 916 F.2d 31, 36 (1st Cir. 1990).

As is the case with sound recordings, there is concern raised over the accuracy and reliability of videotape evidence. However, to authenticate a videotape, absent a well-founded accusation of inaccuracy or impropriety it is sufficient to merely present testimony that the videotape accurately depicts the events being taped. Louis Vuitton S.A. v. Spencer Handbags Corp., 765 F.2d 966, 973-74 (2d Cir. 1985).

More concern can be raised over the subject of a videotape, especially when the videotape depicts a re-enactment or test. It is in these areas that virtual reality may also become most relevant. For example, in Stephenson v. Honda Motors Ltd. of America, the three-dimensional video was essentially a demonstration of a test run over the same terrain as that which the plaintiff traversed on her Honda. As such, the video had some aspects of a re-enactment, and some aspects of a demonstration or test. Some of the issues raised by re-enactments and tests are raised in the next two sections.

4. Re-enactments

Generally speaking, a re-enactment is an attempt to recreate the events which are the subject of the litigation. In contrast, a test, experiment, or demonstration, is intended to illustrate or depict some principle which is relevant to the litigation, but not in a manner meant to simulate the actual events which gave rise to the litigation.

For example, a video of a car braking on an icy road might be offered to demonstrate the manner in which the car and its brakes function under icy conditions, without attempting to show what happened when a plaintiff braked her car. Because evidence must be relevant, however, it may be difficult for a test not to become more like a re-enactment. In a case involving a car accident on icy roads, a video of a car braking on ice offers little in the way of useful and relevant information unless the car is the same car as the plaintiff's, the iciness of the road surface is similar to the that when the plaintiff had her accident, the other aspects of the road surface and the incline or decline of the road are similar, as well as whether it is straight or curved, or wide or narrow, and the lighting conditions or time of day might even have affected whether the plaintiff would have been aware of the ice on the road. If, in order to make the test relevant, all of these factors are accounted for, then the test ends up being a simulation of the actual event giving rise to the litigation, and essentially a re-enactment is created.

When the purpose of an experiment is to simulate actual events, in the Tenth Circuit the experiment may be admissible as evidence if the experiment is performed under conditions "substantially similar to those which are the subject of the litigation. While the conditions need not be identical, they must be sufficiently similar to provide a fair comparison." Four Corners Helicopters, Inc. v. Turbomeca, S.A., 979 F.2d 1434, 1442 (10th Cir. 1992)(videotaped experiment), citingJackson v. Fletcher, 647 F.2d 1020, 1027 (10th Cir. 1981). In Jackson v. Fletcher, the Tenth Circuit held that where "a substantial dissimilarity of conditions prevented a fair comparison and could have misled the jury on a critical element of the case, the admission of the evidence was prejudicial." Four Corners Helicopters, 979 F.2d at 1442, citingJackson, 647 F.2d at 1028.

In Four Corners Helicopters, the proponent of a videotaped experiment argued that it met the test for admissibility of re enactments, and even if it did not, in the alternative it was merely an experiment intended to demonstrate physical principles. 979 F.2d at 1442. The Tenth Circuit found, however, that the experiment mocked certain conditions relevant to the events that were the subject of the litigation, and did so in such a way that it would have confused the jury into thinking it was a re-enactment. 979 F.2d at 1442. As a result, the Tenth Circuit held that the experiment would be held subject to the stricter standard of admissibility applied to re-enactments. See 979 F.2d at 1442.

In Hall v. General Motors Corp., the District of Columbia Circuit held that a test, not a re-enactment, still would not be admissible unless the conditions under which the test was performed were "nearly the same in substantial particulars" as the conditions surrounding the events that were the subject of the litigation. 647 F.2d 175, 180 (D.C. Cir. 1980), citing Illinois Central Gulf R.R. v. Ishee, 317 So. 2d 923, 926 (Miss. 1975), quoted with approval in Barnes v. General Motors Corp., 547 F.2d 275, 277 (5th Cir. 1977). The determination of whether there is substantial similarity is subject to a "clearly erroneous" standard. Hall v. General Motors Corp., 647 F.2d at 179.

5. Tests, Experiments, or Demonstrations

As hinted at in the discussion of Hall v. General Motors Corp., even if a video depicts a test rather than a re-enactment, a court might still require that the test be performed under conditions similar to those that existed at the time of the events which are the subject of the litigation. Nachtsheim v. Beech Aircraft Corp., 847 F.2d 1261, 1278 (7th Cir. 1988), citing Hale v. Firestone Tire & Rubber Co., 756 F.2d 1322, 1333 (8th Cir. 1985) and Sedlack v. General Motors Corp., 253 F.2d 116, 117 (7th Cir. 1958). The standard, therefore, appears to be one of similarity, rather than substantial similarity.

The Tenth Circuit held in Four Corners Helicopters, Inc. v. Turbomeca, S.A., that when an experiment is not an attempt to stage a re-enactment of the events which were the subject of the litigation at hand, but is conducted to demonstrate such things as mechanical principles, it may be admitted "'upon a showing that "the experiment [was] conducted under conditions that were at least similar to those which existed at the time of the [events which were the subject of the litigation]."'" 979 F.2d 1434, 1442 (10th Cir. 1992), quoting Bannister v. Town of Noble, Okla., 812 F.2d 1265, 1270 (10th Cir. 1987), citing Brandt v. French, 638 F.2d 209, 212 (10th Cir. 1981).

In similar fashion in Swajian v. General Motors Corp., the First Circuit refused to overturn an exclusion of a videotaped test and held that, as a general rule, for a videotape of a test to be admissible as evidence, the conditions or events depicted by the videotape must be similar to the relevant circumstances of the case at hand. 916 F.2d 31, 36 (1st Cir. 1990), citing Chase v. General Motors Corp., 856 F.2d 17, 20 (4th Cir. 1988). The test in Swajian was conducted using an experienced driver who knew that a malfunction was about to occur and what kind of malfunction to anticipate, and the test occurred within controlled facilities, with the vehicle intentionally rigged to break down in a particular way. 916 F.2d 31, 36 (1st Cir. 1990).

On the other hand, experiments conducted only to demonstrate the principles informing an expert opinion "need not strictly adhere to the facts."Four Corners Helicopters, Inc. v. Turbomeca, S.A., 979 F.2d 1434, 1442 (10th Cir. 1992), citing Brandt v. French, 638 F.2d 209, 212 (10th Cir. 1981);Nachtsheim v. Beech Aircraft Corp., 847 F.2d 1261, 1278 (7th Cir. 1988), citingBrandt; see also Gladhill v. General Motors Corp., 743 F.2d 1049, 1051 (4th Cir. 1984).

In Nachtsheim v. Beech Aircraft Corp., a videotape was offered into evidence depicting the operation of an aircraft with ice gathering upon its wings. 847 F.2d 1261, 1278 (7th Cir. 1988). The Seventh Circuit held that the videotape could be admissible in view of the fact that the videotape was not offered to re-enact the accident at issue in the litigation, nor was there any suggestion that the experiment simulated actual events. 847 F.2d at 1278. The Seventh Circuit also pointed out inNachtsheim that the videotape touched upon issues covered in oral expert testimony. 847 F.2d at 1278.

A proponent of a videotaped test might avoid exclusion of the videotape by introducing the videotape to the jury in a particular manner, by avoiding the suggestion that the test was meant to simulate actual events and by instructing the jury of the limited purpose for which the test is intended. In addition, in some circumstances objections to certain aspects of a test might go more to the question of the weight which a jury assigns to the test as evidence, rather than serving as grounds for the actual exclusion of the test as evidence.

As stated above, the Seventh Circuit pointed out inNachtsheim that there had been no suggestion that the experiment in that case simulated actual events. Similarly, the Tenth Circuit in Four Corners Helicopters, Inc. v. Turbomeca, S.A., held that if an experiment is offered into evidence merely to demonstrate physical principles, "the experiment should be conducted without suggesting that it simulates actual events." 979 F.2d 1434, 1442 (10th Cir. 1992), citingJackson v. Fletcher, 647 F.2d 1020, 1027 (10th Cir. 1981).

In Four Corners Helicopters the Tenth Circuit also held that when an experiment was conducted only to demonstrate physical principles, the jury should be instructed as to the limited purpose of the evidence. See 979 F.2d 1434, 1442 (10th Cir. 1992), citing Brandt v. French, 638 F.2d 209, 212 (10th Cir. 1981); see also Millers' Natl. Ins. Co. v. Wichita Flour Mills Co., 257 F.2d 93, 97 (10th Cir. 1958).

In Nachtsheim v. Beech Aircraft Corp., the Seventh Circuit found that there were indeed dissimilarities between the conditions under which the experiment was performed and that of the actual events giving rise to the litigation. 847 F.2d 1261, 1278 (7th Cir. 1988) Nonetheless, the Seventh Circuit held that the dissimilarities could be taken into account by the jury when determining how much weight to give to the evidence, and did not require the exclusion of the evidence. 847 F.2d at 1278. The dissimilarities apparently included the fact that the pilot in the experiment was an experienced test pilot, and the fact that he may have manipulated the controls more often than the pilot whose flight was the subject of the litigation. 847 F.2d at 1278.

6. Jury Views

A jury view involves the jury actually traveling to the site where events relevant to the litigation occurred. Because a jury view is disruptive to court proceedings, they are not favored and are ordered only infrequently. G. Joseph, Modern Visual Evidence s. 4.03, at 4-17 (1992). Some courts prohibit views unless they would be "'of essential aid, not merely of some aid,' to the jury," and other alternatives are not adequate. Id., citing see e.g. Seismic Petroleum Services, Inc. v. Ryan, 450 So. 2d 437, 441 (Miss. 1984).

A jury view might be permitted for one of several different reasons. Jury views are sometimes referred to as being either "evidentiary views" or "scene views." Pritchett v. Anding, 310 S.E.2d 267, 271 (Ga. App. 1983).

One reason for permitting a jury view would be to provide the jury with information not otherwise available, or to provide the information in a manner that is more effective than alternative methods of presentation. McLaughlin, Federal Evidence Practice Guide, paragraph 5.13[3], at 5-51 (1992) ("Photographs or videotapes may not be adequate in fully depicting the scene.") A scene view is not intended to provide additional evidence, but rather to help the jury to better understand oral testimony given in the courtroom. See Pritchett, 310 S.E.2d at 271. In Pritchett, the state court trial judge instructed the jury that "any information gained from viewing the premises could be applied to the sworn testimony, but that conclusions from viewing the premises could not be used in place of the sworn testimony." 310 S.E.2d at 271.

The decision to permit a jury view is at the discretion of the trial judge. 2 J. Strong, McCormick on Evidence, s. 216, at 25 (4th ed. 1992); McLaughlin, at 5-51. There are several major considerations that a trial judge is to consider. One is the degree to which the appearance of the site at the time of the view is similar to that at the time of the events which are the subject of the litigation. 2 Strong, at 26; McLaughlin, at 5-51. Another is whether there are less disruptive alternatives which would provide similar information, such as photographs, videotapes, or maps. McLaughlin, at 5-51, see 2 Strong, at 26. In addition, the court should consider the importance of the information to be gained by the view relevant to the issue that it will help determine. 2 Strong, at 25-26.

If a jury view is permitted, there is generally an effort to make the viewed site as similar as possible to its appearance at the time of the events which gave rise to the litigation, as well as an effort to eliminate other information from being presented to the jury. See McLaughlin, at 5-51. For example, other persons not essential to the view might be made to leave the site. Seeid.

Virtual reality might be best characterized as a "virtual reality view," a more accurate alternative to a videotaped view. Like a videotaped view, a virtual reality view would offer certain advantages over an actual view. The use of virtual reality would not be as disruptive to court proceedings as an actual view, and greater control could be exercised over the content of what the jury sees, hears, and otherwise senses. Extraneous information such as smells or sights not relevant to the litigation could also be excluded from the virtual reality presentation. On the other hand, the use of virtual reality would bring with it at least one advantage not offered by videotape. Like an on-site jury view, virtual reality would offer a three-dimensional perspective.

On the other hand, virtual reality could also end up being more disruptive, or perhaps more prejudicial, than either an on-site or a videotaped view if the use of special equipment and the exotic nature of the technology distract the attention of the jury from their main task of observing the subject of the view.

7. Tactile Evidence

By "tactile evidence," the author merely means some form of demonstrative evidence which a juror might touch or otherwise experience by means of senses other than vision or hearing. For the purposes of this article, tactile evidence in the context of virtual reality might include such things as temperature and pressure, wind, dampness, body orientation, and motion. These aspects of virtual reality are the most dissimilar to traditional forms of evidence. Tactile components of virtual reality may be most closely analogous to a jury view, where all of a juror's sense may be brought to bear on the juror's observations of the view site. Because of the newness of the tactile component of virtual reality as a type of evidence, however, the use of the tactile components of virtual reality may present the most problems in terms of admissibility because of questions of relevance, the lack of familiarity on the part of courts with such evidence, and the enhanced potential for prejudicial effect that may accompany tactile aspects of virtual reality. On the other hand, unlike a jury view, virtual reality can be modified to eliminate sensory experiences which are deemed irrelevant or otherwise troublesome to a court.

8. Alternative Methods of Presentation

As mentioned above, one means by which a trial court might exclude evidence in one form and not be reversed on the appellate level is if the trial court permits the same information to be presented to the jury in another form. For example, in Fernandez v. Leonard, a civil rights action, the trial court refused to admit photographs of the deceased plaintiff's body, which would have indicated that he was shot in the back of the head, but pointed out that plaintiff's counsel could make use of independent evidence in the form of an autopsy report to present the same facts to the jury. 963 F.2d 459, 465 n.8 (1st Cir. 1992). Similarly, in Swajian v. General Motors Corp., the appellate court refused to overturn a trial court's decision to exclude a videotape of a crash test, pointing out that the trial court did permit oral testimony about the same test. 916 F.2d 31, 36 (1st Cir. 1990). As discussed above, in Navarro de Cosme v. Hospital Pavia, the trial court excluded photographs it considered "gruesome" of a stillborn infant, but permitted the use of oral expert testimony to serve the same ostensible purpose of the photographs, to argue that death was not caused by an umbilical cord around the neck of the infant prior to birth. 922 F.2d 926, 930-31 (1st Cir. 1991)

II. Virtual Reality Evidence as Scientific Evidence

In addition to the ordinary tests for relevance and the balancing of probative value with the likelihood that evidence will be misleading, confusing, or prejudicial, virtual reality evidence could be subject to a special test for the admissibility of scientific evidence. Until recently, this test focused on whether or not the theory behind the evidence had gained general acceptance in the scientific field in which it belonged. See Frye v. United States, 292 F. 1013 (D.C. Cir. 1923). In 1993, however, the United State Supreme Court revised the test for scientific evidence to focus on relevance and reliability in light of various factors, including the testability of the theory, peer review, and general acceptance in the field. Daubert v. Merrell Dow Pharmaceuticals, Inc., 113 S. Ct. 2786, 2796-97 (1993).

Courts may be tempted to treat virtual reality evidence as scientific evidence simply because it is a new and exotic technology, and because questions may be raised over its accuracy and over which of various different virtual reality technologies are most accurate. However, while virtual reality evidence is certainly novel, and while scientific expert testimony might be required to determine its accuracy, virtual reality evidence probably should not be subjected to the evidentiary test applied to novel scientific evidence if it is not used to present scientific conclusions or to provide information based upon scientific theories.

The first case to address the issue of when scientific evidence should be admitted was Frye v. United States, 292 F. 1013 (D.C. Cir. 1923).United States v. Jakobetz, 955 F.2d 786, 793 (2d Cir. 1992). Under Frye, admissibility of a novel scientific technique as evidence hinged upon whether it had been "'sufficiently established to have gained general acceptance in the particular field in which it belongs.'" United States v. Jakobetz, 955 F.2d 786, 793-94 (2d Cir. 1992), quoting Frye v. United States, 292 F. 1013, 1014 (D.C. Cir. 1923). This acceptance, under Frye, was equated with reliability, with only reliable evidence deemed admissible. Id.

Until the Supreme Court's 1993 Daubert decision, the Frye test remained the majority rule. See, e.g., United States v. Two Bulls, 918 F.2d 56 (8th Cir. 1990); United States v. Piccinonna, 885 F.2d 1529 (11th Cir. 1989); United States v. Smith, 869 F.2d 348 (7th Cir. 1989);United States v. Gillespie, 852 F.2d 475 (9th Cir. 1988); United States v. Smith, 776 F.2d 892 (10th Cir. 1985). See also United States v. Jakobetz, 955 F.2d at 794. However, a minority of jurisdictions had rejected the Frye rule and simply subjected scientific evidence to the same tests as all other evidence. See, e.g., United States v. Jakobetz, 955 F.2d at 794.

In Daubert v. Merrell Dow Pharmaceuticals, Inc., 113 S. Ct. 2786, 2793 (1993), the Supreme Court held that the Frye rule had been superseded for purposes of federal law by the Federal Rules of Evidence. (TheFrye rule still applies under the law of some states. See, e.g., Keene Corp. v. Hall, 626 A.2d 997, 1003 n.2 (Md. App. 1993).) The Daubert Court held that Fed. R. Evid. 702, governing the admission of testimony by expert witnesses, obligates a trial judge to act as a screener for all scientific evidence, assuring its relevance and reliability. In screening scientific evidence, a judge may consider, among other factors, whether or not the scientific theories behind the evidence have been (or can be) tested, whether or not they have been subjected to peer review, and whether or not they are generally accepted in the field. Daubert, 113 S. Ct. at 2796-97. WhileDaubert does give judges discretion to keep some scientific evidence out, it expands theFrye rule in that it lets in some evidence which is not "generally accepted" in the field--in Daubert, the new rule let in testimony by several of the plaintiff's experts that, contrary to generally accepted scientific theories, Bendectin, a prescription anti-nausea drug, can cause birth defects.

Virtual reality evidence has a better chance of admissibility under the new Daubert rule than under the old Frye rule because of the absence of the inflexible general acceptability requirement. However, under Daubert, a trial judge still must review scientific evidence for relevance and reliability in light of the factors laid out in Daubert. Because these review factors were explicitly tied to scientific evidence in Daubert, it seems likely that classifying virtual reality evidence as scientific evidence will still make it more difficult to bring virtual reality evidence into court.

While virtual reality is technologically advanced, it is not clear that virtual reality evidence should be considered scientific evidence. While science may be involved with creating virtual reality, just as science is involved with photographs or video cameras, the content and nature of the information which virtual reality evidence would convey in a given case would not necessarily be scientific. For example, a virtual reality view of terrain for the sake of seeing what the terrain looked like would not present scientific theories or conclusions the way that oral testimony about battered wife syndrome presents scientific theory. Except in cases where virtual reality was used to explain, illustrate, or inform a scientific "fact," the chief question raised would be whether the exotic technological aspects of virtual reality as a medium make it subject to a special rule for the admission of scientific evidence, perhaps even in connection to the more general questions of accuracy and reliability.

One case which would lend credence to an argument that virtual reality evidence should be treated as scientific evidence is United States v. Kilgus, 571 F.2d 508 (9th Cir. 1978). In Kilgus, the only evidence linking the defendants to the illegal distribution of marijuana was the identification of their aircraft by means of an exotic form of imaging developed by the United States military known as a Forward Looking Infrared system (FLIR). 571 F.2d at 509-10. A customs officer testified that he viewed an FLIR image of a plane from a distance which landed in a remote area and was intercepted by ground vehicles which were later stopped and found to contain marijuana. Id. Later, the same customs officer viewed an FLIR image of a plane landing at an airport which he thought looked like the FLIR image of the first plane.Id. His conclusion was based upon the fact that both aircraft appeared to be of a certain type, and that he recognized similar "spots" on the same locations of the FLIR images of both planes. 571 F.2d at 510. Persons aboard the plane which landed at the airport were arrested, tried, and convicted based upon the customs officer's "identification" of the plane. Id.

In essence, no scientific conclusions were drawn by the customs officer and presented to the jury. He merely made an identification of something he "viewed" through a rather exotic device. However, prompted by concerns over the reliability and accuracy of the image, the Ninth Circuit treated the testimony concerning the FLIR image as scientific evidence and applied the old Frye test to reverse the convictions. Id. The court held:

Several serious problems exist as to Officer Gibbs' testimony regarding the "unique identification" of these aircraft through the use of FLIR. First, Officer Gibbs admitted that he did not understand the theory behind the FLIR equipment, that he never made any particular study of FLIR's and that he has had no training in the unique identification of aircraft from a remote distance. Second, the performance of the FLIR is affected by barometric pressures, temperature, humidity and other atmospheric conditions. There is no testimony to show that these factors were the same on the lake bed in the middle of the night as they were after sun up in Las Vegas. Third, defense counsel were in essence foreclosed from impeaching either Officer Gibbs' testimony or his reliance on the FLIR system because most of the necessary technical information was shrouded in military secrecy. Finally, and most importantly, the unrebutted testimony of the defense's expert was that the FLIR is not a generally accepted technique among the scientific community for the unique identification of remote objects.

A necessary predicate to the admission of scientific evidence is that the principle upon which it is based 'must be sufficiently established to have gained general acceptance in the particular field in which it belongs.' United States v. Brown, 557 F.2d 541, 556 (6th Cir. 1977), quoting Frye v. United States, 54 App. D.C. 46, 293 F. 1013, 1014 (1923); see also United States v. Amaral, 488 F.2d 1148, 1152-53 (9th Cir. 1973).

Id. (emphasis in original).

III. Arguments For and Against the Admissibility of Virtual Reality Evidence

As mentioned above, in Stephenson v. Honda Motors Ltd. of America, Honda's counsel succeeded in persuading a California Superior Court to admit virtual reality evidence. The circumstances of Stephenson help illustrate how virtual reality can become relevant to the presentation of evidence in a trial, as well as some of the concerns which might be raised by its admission.

The Stephenson case involved a plaintiff who suffered an accident while riding a Honda motorcycle. One of Honda's arguments against awarding damages was that the plaintiff foolishly undertook an unreasonable risk by riding a motorcycle on terrain that defense counsel argued was extremely treacherous.

In order to help the jury understand the nature of the terrain, and what it would have been like to encounter it on a motorcycle, the defense obtained the court's permission to have the jury wear special virtual reality-type goggles and view a three-dimensional motion picture of the terrain, from the point of view of a rider on a motorcycle. There was no sound provided with the motion picture. After the ride through the terrain, the image then backtracked the course more slowly.

The aspect of virtual reality which made it useful in this instance was that a three-dimensional viewing of the terrain would do more to help the jury understand what the terrain was like than an ordinary two-dimensional view, and certainly more than oral testimony concerning someone's impressions of the terrain.

A. Arguments for Admissibility of Virtual Reality Evidence

As stated above, virtual reality evidence can be viewed in several different ways. On the one hand, virtual reality is merely a compilation of several media which already are used as methods for presenting information to a jury. Virtual reality at its most advanced level consists of a three-dimensional motion picture, stereo sound, and a body suit which subjects the wearer to temperature and pressure. In addition, wetness or wind could conceivably be added to the tactile stimulation of the wearer.

One must ask what virtual reality adds to the presentation of information that these other media do not provide. The main differences are that the video is three-dimensional, that the sights and sounds of the presentation can occupy the entire visual field and aural reception of the juror, and that the body suit would seem to be completely new. Finally, there may be instances where a computer-generated video is used. However, this technique is not unique to virtual reality in that it is also used for ordinary videos.

The three-dimensional and all-inclusive aspects of virtual reality make the experience more like a jury view, although the court and counsel may control the sounds and images to which the jury is exposed.

As seen in Stephenson, where virtual reality should be admitted is when it provides information to the finder of fact that is not otherwise available, or in a way that is more effective and otherwise preferable to the alternative. For example, as in Stephenson, there are circumstances in which a three-dimensional view provides more or better information to the jury. If that information is relevant, then there are grounds for the use of virtual reality. In Stephenson, the information communicated by the three-dimensional view was an enhanced view of how treacherous the terrain was, which was relevant to the issue of comparative negligence. In contrast, in the case of a hidden FBI video of a Congressman taking a bribe, there might not be additional relevant information communicated by a three- dimensional view which would not be obtained from an ordinary two-dimensional view. The relevant information to be obtained from the video is the identity of the Congressman and the events that transpired when money changed hands.

There may also be circumstances in which there are even more accurate methods of presenting information to a jury than virtual reality, but virtual reality is nonetheless preferable for various reasons. For example, a jury might actually be ridden over the rough terrain in Stephenson on a motorcycle, but a court would risk the loss of its jurors. In addition, virtual reality offers courts and attorneys the opportunity to place a jury "on the scene," while still being able to control what the jury sees and the manner in which the jury sees it. The lack of this type of control is one shortcoming of a jury view.

Another shortcoming of a jury view, as pointed out above, is that conditions may have changed between the time of the events which are the subject of the litigation and the time of the view. Virtual reality which makes use of computer- generated images might help reconstruct conditions similar to those existing at the time the relevant events took place.

B. Arguments Against the Admissibility of Virtual Reality Evidence

Several arguments might be made against the admission of virtual reality evidence. First, in any given case it could be argued that a court should examine the additional information conveyed by virtual reality evidence that is not conveyed by oral testimony or by a video, and ask whether that additional information is relevant, or whether the probative value of the information outweighs the potential for prejudice. In some cases, three dimensional viewing is not necessary, and temperature and pressure from a body suit might be irrelevant.

Second, in some cases there may be a danger of prejudice from the use of virtual reality evidence. For example, a frail and timid juror might lose objectivity if she was forced to see what it would be like to bungie-jump and have her rope snap, under the guise of helping her to understand the shock and mental suffering of a deceased plaintiff hurtling to the earth. Certain prejudices and idiosyncrasies may come into play when a juror is made to experience virtual reality that might not come into play when the same juror views the same subject on an ordinary video screen or listens to oral testimony conveying the same information.

For example, in Stephenson, it might have been just as useful to place experts on the witness stand to testify whether they thought a rider of the level of expertise of the plaintiff would have prudently chosen to ride over the terrain in question. Photographs might also have been submitted. It may be that some jurors decided that the terrain was more treacherous than it really was because they are easily frightened by the prospect of riding a motorcycle over any wild terrain, even terrain that would be relatively safe. The sight of the terrain in a stark virtual reality image may have aroused their prejudices rather than informing their objective judgment.

On the other hand, of course, it could be argued that there are circumstances where informing the judgment of the jury requires a presentation that is more "real."

IV. Conclusion

If virtual reality can provide a jury with relevant information that other methods of presentation cannot provide, or if virtual reality is much more effective than other forms of evidence at presenting relevant information, virtual reality evidence should be admissible unless there is some reason in a particular case that the method of presentation would be confusing or misleading, or is so shocking that it has a prejudicial impact which surpasses the probative value of the evidence.

Virtual reality evidence would often be, in essence, a virtual reality view, a three-dimensional version of a videotaped view. A chief argument in favor of admissibility might be that virtual reality might be preferable to an actual view, in that the contents of the view would be more easily controlled by the court, and irrelevant aspects of the view might be kept from the jury. For example, in demonstrating machinery, where the sound of the machinery is irrelevant it might be shut off. On a view, the loud and garish sound of machinery might subconsciously make some jurors feel that the machinery is more dangerous than it is. In addition, virtual reality might substitute for a view in cases where a view would be dangerous, but at the same time a videotape would be inadequate. For example, in Stephenson v. Honda Motor Company Ltd. of America, no court would have had a jury ride motorcycles over dangerous terrain, but at the same time an ordinary videotape would not have presented as accurate an image of the terrain as virtual reality.

Ultimately, a court will have to determine exactly what information is communicated by the virtual reality medium that would not be presented, or that would not be presented as well, by another medium, whether the information adds to the relevant information the jury needs to make its decisions, and whether there is also a prejudicial impact that outweighs the benefits of virtual reality. Because there are several different components of virtual reality, it may be that in a given case a court will admit one component, but exclude others because they are irrelevant or because they will be more shocking. For example, the visual component might be employed, but not sound or pressure or g-forces. In the end, a litigator with a legitimate use for virtual reality evidence should be able to present sound arguments for the admissibility of at least some aspects of the virtual reality medium.

Revised and updated June 30, 1994