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Abbreviated CGA. A CGA is a drawing , or drawings, created by a computer that, when assembled frame by frame, produce the image of motion. The image is merely a graphic representation depicting the previously formed opinion of a witness or witnesses. F. Galves, Where the Not So Wild Things Are: Computers in the Courtroom, the Federal Rules of Evidence, and the Need for Institutional Reform and More Judicial Acceptance, 13 Harv. J.L. & Tech. 161, 22730 (2000). Presently, the CGA is akin to the traditionally permitted drawings used by crime scene reconstructionists to show bullet path trajectory. Accordingly, a CGA is only as credible as the underlying testimony that it represents and the computer plays no part in calculating an outcome or presenting its own conclusions.

Conversely, computer generated simulations do not depict witness opinion; rather, the computer program, based upon the data entered, draws a conclusion. As such, a computer simulation presents not only the testimony of an expert regarding the programming and data input but also a conclusion of the computer based upon the formulas programmed to use the raw data entered. For example, scientists use computer simulations to predict the effects of earthquakes on ...

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