The effect of mark enhancement techniques on the subsequent detection of semen/spermatozoa

Simmons, Rory, Deacon, Paul, Phillips, Darren and Farrugia, Kevin (2014) The effect of mark enhancement techniques on the subsequent detection of semen/spermatozoa. Forensic Science International, 244. pp. 231-246. ISSN 03790738

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Abstract

Fingermarks, footwear marks, blood and semen are amongst the most commonly encountered types of evidence at crime scenes. Previous work has extensively investigated fingermark and blood enhancement techniques and a sequence developed to maximise evidence recovery; however, there is limited research as to the effect of these techniques on the subsequent detection of body fluids such as semen.

In this study, seven fingermark and blood enhancement techniques (e.g. powder suspension, cyanoacrylate fuming and acid violet 17) were employed followed by the subsequent detection of semen/spermatozoa. Other variables included in the study were the use of two substrates (white ceramic tiles and grey laminate flooring), a depletion series and ageing periods of 1, 7, 14 and 28 days. The effect these techniques had on the subsequent detection of semen was assessed by visual and fluorescence examination followed by presumptive and confirmatory testing for semen and spermatozoa.

The results found that protein stains (acid violet 17 and acid yellow 7) caused a loss in presumptive test reactivity; however, sperm heads were still observed using microscopic examination after extraction and staining. The use of black magnetic powder, Bluestar® Forensic Magnum luminol, Lumicyano™ 4% and cyanoacrylate fuming followed by basic yellow 40 staining did not hinder subsequent presumptive and confirmatory tests for semen and sperm heads. Powder suspension caused a loss in both presumptive test reactivity and sperm heads from the substrate. In general, the enhancement techniques resulted in the improved visualisation of the semen stains under white and violet/blue light. The results from this study aim to provide a strategy to maximise evidence recovery and improve efficiency in an integrated forensic approach.

Item Type:	Article
Uncontrolled Keywords:	Semen, spermatozoa, blood, fluorescence, finger/footwear mark enhancement, integrated forensic approach
Subjects:	F400 Forensic and Archaeological Science
Department:	Faculties > Health and Life Sciences > Applied Sciences
Depositing User:	Becky Skoyles
Date Deposited:	04 Nov 2014 11:55
Last Modified:	12 Oct 2019 18:29
URI:	http://nrl.northumbria.ac.uk/id/eprint/17918

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