Determining the number of test fires needed to represent the variability present within firearms of various calibers.

Abstract:

:The Association of Firearm and Toolmark Examiners recommends a minimum of two test fires be performed when an unknown firearm is submitted to a laboratory prior to doing a comparison with a cartridge case collected from a crime scene. Limited research has been performed to determine how many test fires are necessary to be representative of the match distribution of a firearm. Various makes and models of firearms comprising five calibers were tested using a hybrid equivalence test to determine how many cartridge cases were required to represent the match distribution of an unknown firearm based on both breech face and firing pin correlation scores from an IBIS® HeritageTM System. The same general trend was observed for each caliber of firearm where the equivalence percentage increased from 10 to 30 cartridge cases. Overall, 15 cartridge cases are sufficient for above an 80% probability of representing the full match distribution for an unknown firearm. To approach full equivalence, 25 cartridge cases are enough because 30 cartridge cases were not found to be significantly higher in equivalence percentage for any caliber of firearm tested.

journal_name

Forensic Sci Int

authors

Law EF,Morris KB,Jelsema CM

doi

10.1016/j.forsciint.2018.06.010

subject

Has Abstract

pub_date

2018-09-01 00:00:00

pages

56-61

eissn

0379-0738

issn

1872-6283

pii

S0379-0738(18)30330-X

journal_volume

290

pub_type

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