Statistical Confirmation of Empirical Observations Concerning Tool Mark Striae

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2007-07-01
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Faden, D.
Kidd, J.
Craft, J.
Morris, Max
Kreiser, J.
Davis, S.
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Abstract

Toolmarks produced by 44 sequentially manufactured screwdriver tips have been characterized for surface roughness using a profilometer. Toolmarks were produced in lead at angles of 30°, 60°, and 85°. A computer program developed to compare and match the profilometer data has been used to show that marks from a single tip produced at similar angles yield much higher correlation values than marks produced from the same tip but at different angles. This analysis provides statistical support for the widely-accepted empirical observation that toolmark striae must be reproduced at similar angles in order to be unambiguously identified as being made by a particular tool.

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This article is from AFTE Journal 39 (2007): 205. Posted with permission.

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Mon Jan 01 00:00:00 UTC 2007
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