Commonwealth v. Serge

Supreme Court of Pennsylvania · 2006 · Evidence

586 Pa. 671 (2006)

Updated August 22, 2026

Evidencecomputer-generated animationCGAdemonstrative evidenceauthenticationrelevanceunfair prejudicePa.R.E. 401

Facts

Before trial, the Commonwealth moved in limine to present a computer-generated animation based on forensic and physical evidence to illustrate its theory of how Appellant shot his wife and staged the scene as self-defense. At trial, the Commonwealth used the animation during the testimony of its forensic pathologist and crime scene reconstructionist to show the parties' positions, the bullet paths, and the theory that the victim's body had been moved. The trial court admitted the animation as demonstrative evidence after requiring foundational support and gave detailed instructions that it was not substantive evidence and only illustrated the Commonwealth's experts' opinions. Appellant objected that the animation lacked authentication and foundation and was cumulative and unfairly prejudicial.

Issue

Whether a computer-generated animation illustrating the Commonwealth's theory of the homicide was admissible as demonstrative evidence. More specifically, the question was whether the animation was properly authenticated, relevant, and sufficiently probative to survive Rule 403 balancing despite its visual force.

Rule

A computer-generated animation is potentially admissible in Pennsylvania as demonstrative evidence if it is: (1) properly authenticated under Pa.R.E. 901 as a fair and accurate representation of the evidence or expert opinion it purports to portray; (2) relevant under Pa.R.E. 401 and 402; and (3) more probative than unfairly prejudicial under Pa.R.E. 403. A CGA is treated like other demonstrative exhibits, not as a special category of evidence, and its persuasive force alone is not a proper ground for exclusion.

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One of 10 multiple-choice questions for this case. Pick an answer to see why.

In a homicide trial in Pittsburgh, the prosecution offers a computer-generated animation showing the shooter’s location, the victim’s posture, and bullet paths. The animator testifies that he built the animation from measurements taken at the scene and revised it repeatedly to match the opinions of the prosecution’s pathologist and reconstruction expert, both of whom also testify that it fairly illustrates their already-formed opinions.

The defense objects that the animation is unauthenticated because no witness saw the shooting occur. How should the court rule?

Explanation. A computer-generated animation is treated like other demonstrative evidence. Under the majority opinion, it is properly authenticated under Rule 901 when witnesses with knowledge testify that it fairly and accurately represents the evidence or expert opinion it purports to depict. An eyewitness is not required, and the animation need not reflect the computer’s own conclusions.