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NCJ Number: NCJ 241215     Find in a Library
Title: Confocal Microscopy Analysis of Breech Face Marks on Fired Cartridge Cases from 10 Consecutively Manufactured Pistol Slides
  Document URL: HTML 
Author(s): Todd J. Weller, M.S. ; Alan Zheng, B.S. ; Robert Thompson, B.S. ; Fred Tulleners, M.A.
  Journal: Journal of Forensic Sciences  Volume:57  Issue:4  Dated:July 2012  Pages:912 to 917
Date Published: 07/2012
Page Count: 6
  Annotation: This research examines microscopic marks produced from firearms and tools.
Abstract: Recent publications from the National Academy of Sciences have called for additional foundational research in the field of firearm and toolmark analysis. The authors examined test fires from 10 pistol slides with consecutively manufactured breech faces. A total of 9 test fires from each pistol slide, for a total of 90 test fired cartridge cases, were compared using confocal microscopy combined with three-dimensional cross-correlation analysis algorithms. A total of 8,010 comparisons were performed (720 matches and 7,290 nonmatches). The average score for matches was 0.82 with a standard deviation of 0.06. The average score for nonmatches was 0.20 with a standard deviation of 0.03. Additionally, subclass toolmarks were observed on the breech faces, but the presence of subclass was not detected in the correlation analysis. There was no overlap of scores between matching and nonmatching test fires. This provides objective data that support the AFTE (Association of Firearms and Tool Mark Examiners) theory of identification. Abstract published by arrangement with John Wiley & Sons.
Main Term(s): Forensics/Forensic Sciences
Index Term(s): Toolmark identification ; Firearms ; Scientific techniques
Type: Research (Applied/Empirical)
Country: United States of America
Language: English
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