FORMS OF COMPUTER GENERATED EVIDENCE (CGE)
The admissibility of the evidence will reflect the type of evidence it is: (1) demonstrative evidence or (2) substantive or real evidence.
The two main forms of computer generated evidence regarding accident reconstruction are computer generated animations and computer generated simulations.
Animations are pure demonstrative trial aids. They are computer generated drawings assembled frame by frame that, when viewed sequentially, produce the image of motion. Their reliability is completely dependent upon the expert’s testimony and credibility. Ie.- illustrate factual findings and conclusions of the expert, illustrate factual findings. See Constans v. Choctaw Transport, Inc., 97-0863 (La.App. 4 Cir. 12/23/97),712 So.2d 885.
Simulations, on the other hand, are substantive evidence. They add new facts to the case and have probative value in themselves. Whereas animations only illustrate data, computer simulations are based upon mathematical models that generally involve the input and manipulation of data. In computer simulation, the computer essentially becomes a witness, by not only illustrating the evidence but also presenting it. See e.g. Pino v. Gauthier, 633 So.2d 638 (La.App. 1 Cir. 12/29/93)
The admissibility rules for CGE is different depending upon whether the evidence is an animation or a simulation. Basically, simulations are subject to the more strenuous Daubert rules of admissibility for scientific evidence.
Although an animation is more likely to be admitted as evidence, since it is only demonstrative, a simulation is more likely to be permitted for the jury to view during deliberation because of its independent probative value.
Also, purely demonstrative evidence may not be permitted in opening/closing statements.
VIDEO EVIDENCE GENERALLY
The determination of whether motion pictures or videotapes are admissible is largely within the discretion of the trial court. Olivier v. LeJeune, 95-0053 (La.2/28/96), 668 So.2d 347; Lafleur v. John Deere Co., 491 So.2d 624, 632 (La.1986).
The trial court must consider: (1) whether the videotape accurately depicts what it purports to represent, (2) whether it tends to establish a fact of the proponent's case, and (3) whether it will aid the jury's understanding.
Against those factors, the trial court must consider whether the videotape will unfairly prejudice or mislead the jury, confuse the issues, or cause undue delay. The trial court may exclude the evidence if the factors favoring admission are substantially outweighed by the factors against admission. Louisiana Code of Evidence arts. 401 - 403; U.S.F. & G. v. Hi-Tower Concrete Pumping, 574 So.2d 424, 438 (La.App. 2nd Cir.1991).
If the CGE is actually a program that provides the reconstruction by inserting figures and variables for the computer to perform mathematical evaluations, then it will also have to pass the reliability and trustworthiness standards of Daubert.
The trial court applies several factors to determine whether the reasoning and methodology underlying the simulation is scientifically valid and can properly be applied to the facts at issue.
These factors include (1) whether the expert's theory or technique can be and has been tested; (2) whether the theory or technique has been subjected to peer review and publication; (3) the technique's known or potential rate of error; and (4) whether the methodology is generally accepted in the scientific community.
When evaluating the admissibility of the simulation: