Automatic Comparison and Evaluation of Impressions Left by a Firearm on Fired Cartridge Cases

Details

Serval ID
serval:BIB_FB07A37D2A0A
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Automatic Comparison and Evaluation of Impressions Left by a Firearm on Fired Cartridge Cases
Journal
Journal of Forensic Sciences
Author(s)
Riva F., Champod C.
ISSN
1556-4029
ISSN-L
1556-4029
Publication state
Published
Issued date
05/2014
Peer-reviewed
Oui
Volume
59
Number
3
Pages
637-647
Language
english
Abstract
Recent years have been characterized by a series of publications in the field of firearms investigation questioning the reliability and objectivity of such examination. This research investigates new solutions to decrease the subjective component affecting the evaluation that follows the comparison of impressions left by a firearm on the surface of spent cartridge cases. An automatic comparison system based on 3D measurements has been developed and coupled to a bivariate evaluative model allowing assigning likelihood ratios. Based on a dataset of 79 pistols (all SIG Sauer 9 mm Luger caliber), the system shows a very high discriminating power and the LRs that it provides are very indicative of the true state under both the prosecution and the defense propositions. For example, likelihood ratios exceeding a billion are predominantly obtained when impressions originating from the same source are compared. The system is also characterized by relatively low rates (≤1%) of misleading evidence depending on the firearm considered.
Keywords
forensic science, firearms identification, likelihood ratio, cartridge cases, 3D topographies, evaluation
Create date
16/06/2014 9:03
Last modification date
01/07/2020 6:26
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