The prevalence of two ‘commonly’ encountered synthetic target fibres within a large urban environment

Palmer, Ray, Burnett, Elisabeth, Luff, Natalie, Wagner, Craig, Stinga, Georgia, Carney, Clare and Sheridan, Kelly (2015) The prevalence of two ‘commonly’ encountered synthetic target fibres within a large urban environment. Science & Justice, 55 (2). pp. 103-106. ISSN 1355-0306

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Official URL: http://dx.doi.org/10.1016/j.scijus.2015.01.001

Abstract

A target fibre study was carried out to assess the random prevalence of two ostensibly commonly encountered synthetic fibre types; black acrylic and blue polyester. The study was performed in an environment which maximised the number of random contacts between textile garments in the population and specific surfaces, namely; seating relating to buses, public houses and cinemas found within a large urban conurbation.

Surface debris tapings were collected from samples of bus seats (30), pub seats (54) and cinema seats (53). Using low power stereomicroscopy, a total of 114 and 68 fibres, superficially similar to the respective black acrylic and blue polyester target fibres, were recovered from these tapings. The full range of comparative microscopical and instrumental analysis used in operational forensic laboratories was performed on the recovered fibres.

No matches were found with either of the target fibres.

These findings are in accordance with similar studies which show that the probability of an ‘adventitious’ match with a particular fibre type/colour combination is extremely low. In addition, the findings demonstrate that the current techniques and instrumentation employed by operational forensic laboratories are fit for purpose.

Importantly, the findings demonstrate that databases and surveys (e.g. fibre population studies) which do not consider the analytical/comparison processes, must not be used in isolation when evaluating fibre evidence at source level.

Item Type: Article
Uncontrolled Keywords: fibres, evidence evaluation, target fibre studies, Bayesian framework, discrimination, instrumental analysis
Subjects: F400 Forensic and Archaeological Science
Department: Faculties > Health and Life Sciences > School of Life Sciences > Applied Sciences
Depositing User: Kelly Sheridan
Date Deposited: 12 Mar 2015 14:21
Last Modified: 08 May 2017 12:15
URI: http://nrl.northumbria.ac.uk/id/eprint/21598

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