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The importance of dark adaptation for forensic examinations; an evaluation of the Crime-lite Eye™

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journal contribution
posted on 13.11.2018 by Beth McMurchie, Roberto S.P. King, Paul Kelly, George Torrens
Forensic practitioners are recommended to dark adapt their eyes prior to conducting evidential searches in the dark. The dark adaptation process remains poorly standardised across the discipline, with little quantified regarding the benefits of such preparative steps. Herein, we report the findings of a study that recruited 50 participants to assess the effectiveness of the Crime-lite Eye™ a darkness adaptation device developed to assist forensic practitioners both in the laboratory and in field. Participants were tasked with searching for the fluorescent signatures left by reaction of 1,8-diazafluoren-9-one (DFO) with amino acids, in a manner akin to the fluorogenic fingerprint treatment of porous evidence. Using an Epson Stylus Photo R265 inkjet printer, ink cartridges were filled with alanine solutions of various concentrations, allowing different motifs to be printed onto copy paper and subsequently developed using DFO. Participants searched for this ‘evidence’ both with and without dark adapted vision. On average, participants were able to locate and correctly recognise 16% more evidence once dark adapted using the Crime-lite Eye™. The increase in evidence located by participants once dark adapted suggests that crime scene officers should be dark adapting in order to visualise as much as possible. The time taken to dark adapt, 10 min on average during this study, is not excessively long, and should not significantly slow the investigation.

History

School

  • Science

Department

  • Chemistry

Published in

Science and Justice

Volume

59

Issue

2

Pages

138-144

Citation

MCMURCHIE, B. ... et al, 2018. The importance of dark adaptation for forensic examinations; an evaluation of the Crime-lite Eye™. Science and Justice, 59 (2), pp.138-144.

Publisher

Elsevier © The Chartered Society of Forensic Science

Version

AM (Accepted Manuscript)

Publisher statement

This paper was accepted for publication in the journal Science and Justice and the definitive published version is available at https://doi.org/10.1016/j.scijus.2018.10.006

Acceptance date

21/10/2018

Publication date

2018-10-24

Copyright date

2019

ISSN

1355-0306

Language

en

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