Abstract
A total of 169 college freshman were presented with a mock transcript of a sexual assault trial. We varied both polygraph expert testimony indicating that the defendant was deceptive (polygraph/no polygraph) and testimony by a medical expert and eyewitness who further corroborated the defendant's guilt (corroborating evidence/no corroborating evidence). Whereas the presence of corroborating evidence influenced verdicts as well as probability of commission (PC) estimates regarding the defendant, evidence of a failed polygraph test did not significantly influence verdicts or PC estimates, nor did the presentation of polygraph evidence interact with the corroborating evidence.
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