The Court of Appeals of Washington has ordered a new trial in a criminal case in which the State admited into evidence computer-generated simulation evidence using Version 6.2 of a program called PC-CRASH to prove that defendant had been the driver of the vehicle involved in the wreck.
The Court held that “we cannot be confident that a scientific consensus has been achieved among accident reconstructionists that PC-CRASH is capable of accurately performing the predictions to which the State’s expert witness testified.” Therefore, the Court reversed a jury verdict against the defendant and remanded the case for a new trial.
More specifically, the Court said that “[j]urisdictions that have addressed the issue uniformly hold that the admissibility of computer-generated models or simulations (as opposed to animations) as substantive proof or as the basis for expert testimony regarding matters of substantive proof is conditioned upon a sufficient showing that (1) the computer is functioning properly; (2) the input and underlying equations are sufficiently complete and accurate (and disclosed to the opposing party so that they can be challenged); and (3) the program is generally accepted by the appropriate community of scientists for use in the particular situation at hand. [Citations omitted.] We agree with these courts, and hold that in Washington, computer-generated simulations used as substantive evidence or
as the basis for expert testimony regarding matters of substantive proof must have been generated from computer programs that are generally accepted by the appropriate community of scientists to be valid for the purposes at issue in the case.”


