Campus Units

Center for Statistics and Applications in Forensic Evidence (CSAFE)"

Document Type

Article

Publication Version

Accepted Manuscript

Publication Date

2-2018

Journal or Book Title

Forensic Science International

Volume

283

First Page

173

Last Page

179

DOI

10.1016/j.forsciint.2017.11.038

Abstract

Randomly acquired characteristics (RACs), also known as accidental marks, are random markings on a shoe sole, such as scratches or holes, that are used by forensic experts to compare a suspect's shoe with a print found at the crime scene. This article investigates the relationships among three features of a RAC: its location, shape type and orientation. If these features, as well as the RACs, are independent of each other, a simple probabilistic calculation could be used to evaluate the rarity of a RAC and hence the evidential value of the shoe and print comparison, whereas a correlation among the features would complicate the analysis. Using a data set of about 380 shoes, it is found that RACs and their features are not independent, and moreover, are not independent of the shoe sole pattern. It is argued that some of the dependencies found are caused by the elements of the sole. The results have important implications for the way forensic experts should evaluate the degree of rarity of a combination of RACs.

Comments

Kaplan, N., Wiesner, S., Shor, Y., Mandel, M., Yekutieli, Y., Spiegelman, C., Dependence among randomly acquired characteristics on shoeprints and their features. Forensic Science International, 283(February 2018);173-179 doi: 10.1016/j.forsciint.2017.11.038 Posted with permission of CSAFE.

Copyright Owner

Elsevier B.V.

Language

en

File Format

application/pdf

Published Version

Share

COinS