skip navigation

CrimeSolutions.gov

Add your conference to our Justice Events calendar

PUBLICATIONS

NCJRS Abstract

The document referenced below is part of the NCJRS Library collection.
To conduct further searches of the collection, visit the NCJRS Abstracts Database.

How to Obtain Documents
 
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
Journal: Journal of Forensic Sciences  Volume:57  Issue:4  Dated:July 2012  Pages:912 to 917
Author(s): Todd J. Weller, M.S. ; Alan Zheng, B.S. ; Robert Thompson, B.S. ; Fred Tulleners, M.A.
Date Published: 07/2012
Page Count: 6
Document: HTML 
Type: Research (Applied/Empirical)
Language: English
Country: United States of America
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
   
  To cite this abstract, use the following link:
https://www.ncjrs.gov/App/Publications/abstract.aspx?ID=263305

* A link to the full-text document is provided whenever possible. For documents not available online, a link to the publisher's web site is provided.