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Title: Objective analysis of impressed chisel toolmarks

Historical and recent challenges to the practice of comparative forensic examination have created a driving force for the formation of objective methods for toolmark identification. In this study, fifty sequentially manufactured chisels were used to create impression toolmarks in lead (500 toolmarks total). An algorithm previously used to statistically separate known matching and nonmatching striated screwdriver marks and quasi-striated plier marks was used to evaluate the chisel marks. Impression toolmarks, a more complex form of toolmark, pose a more difficult test for the algorithm that was originally designed for striated toolmarks. Lastly, results show in this instance that the algorithm can separate matching and nonmatching impression marks, providing further validation of the assumption that toolmarks are identifiably unique.
Authors:
 [1] ;  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Report Number(s):
IS-J-8922
Journal ID: ISSN 0022-1198
Grant/Contract Number:
2011-DNR-0230; AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
Journal of Forensic Sciences
Additional Journal Information:
Journal Volume: 60; Journal Issue: 6; Journal ID: ISSN 0022-1198
Publisher:
Wiley
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
47 OTHER INSTRUMENTATION; 97 MATHEMATICS AND COMPUTING; forensic science; statistical comparison; chisel; impression; algorithm; toolmark
OSTI Identifier:
1350048
Alternate Identifier(s):
OSTI ID: 1400521