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Journal Article

Citation

Riva F, Champod C. J. Forensic Sci. 2014; 59(3): 637-647.

Affiliation

School of Criminal Sciences, Institute of Forensic Science, University of Lausanne, Quartier Sorge, CH-1015, Lausanne, Switzerland.

Copyright

(Copyright © 2014, American Society for Testing and Materials, Publisher John Wiley and Sons)

DOI

10.1111/1556-4029.12382

PMID

24502645

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.


Language: en

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