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The Testimony of Forensic Identification Science: What Expert Witnesses Say and What Factfinders Hear

The Testimony of Forensic Identification Science: What Expert Witnesses Say and What Factfinders... This research examined how variations in the presentation of forensic science information affect factfinders’ judgments in a trial. Participants read a summary of a murder case, the critical testimony being the results of a microscopic hair comparison given by a forensic expert. Across two experiments we manipulated how the expert expressed his results, whether he gave an explicit conclusion concerning identity of the hair, and whether the limitations of forensic science were expressed during trial. Qualitative testimony was more damaging to the defense than quantitative testimony, conclusion testimony increased the defendant’s culpability ratings when findings were presented quantitatively, and expressing limitations of forensic science had no appreciable effect. Results are discussed in terms of factfinders’ interpretation of forensic identification evidence. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Law and Human Behavior American Psychological Association

The Testimony of Forensic Identification Science: What Expert Witnesses Say and What Factfinders Hear

Law and Human Behavior , Volume 33 (5): 18 – Oct 4, 2009

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References (70)

Publisher
American Psychological Association
Copyright
Copyright © 2009 American Psychological Association
ISSN
0147-7307
eISSN
1573-661X
DOI
10.1007/s10979-008-9169-1
pmid
19259800
Publisher site
See Article on Publisher Site

Abstract

This research examined how variations in the presentation of forensic science information affect factfinders’ judgments in a trial. Participants read a summary of a murder case, the critical testimony being the results of a microscopic hair comparison given by a forensic expert. Across two experiments we manipulated how the expert expressed his results, whether he gave an explicit conclusion concerning identity of the hair, and whether the limitations of forensic science were expressed during trial. Qualitative testimony was more damaging to the defense than quantitative testimony, conclusion testimony increased the defendant’s culpability ratings when findings were presented quantitatively, and expressing limitations of forensic science had no appreciable effect. Results are discussed in terms of factfinders’ interpretation of forensic identification evidence.

Journal

Law and Human BehaviorAmerican Psychological Association

Published: Oct 4, 2009

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