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Simultaneous detection and image capture of biological evidence using a combined 360<sup>°</sup>camera system with single wavelength laser illumination

Sheppard, K, Fieldhouse, SJ and Cassella, JP (2018) Simultaneous detection and image capture of biological evidence using a combined 360<sup>°</sup>camera system with single wavelength laser illumination. Science and Justice. ISSN 1355-0306

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Abstract

The Chartered Society of Forensic Sciences Forensic investigators frequently utilise light sources to detect and presumptively identify biological evidence. The instrumentation typically deploys single or multiple wavelength exposures at various intensities, which interact with constituents of biological material, initiating fluorescence or improving contrast between the material and substrate. Documentation using sketches and/or photographic approaches follows detection, which are essential for scene reconstruction. Recent research has demonstrated the simultaneous detection and capture of biological evidence using a 360° camera system combined with an alternate light source exhibiting broad wavelength ranges of light. Single wavelength light sources reportedly offer enhanced sensitivity, due to the increased light intensity and narrower bandwidth of light, although their combined use with a 360° camera system has not yet been explored. Samples of human blood, semen, saliva, and latent fingermarks were deposited on to a variety of substrates. A 360° camera system combined with a laser light source was used to detect and capture the samples. Ten participants were asked to detect the samples on images of the substrates without ground truth knowledge. It was possible to detect and capture biological evidence, although success varied according to substrate colour and light intensity. Advantageously, presumptive screening for biological fluids and the simultaneous location and visualisation of such evidence as part of a 360° panorama of the scene for contextual purposes was permitted. There was no fluorescent response from the fingermarks, although the oblique lighting effects appeared sufficient to aid mark detection in some circumstances. The use of single wavelength illumination clearly facilitates identification of a range of forensically important material. When coupled with a 360-degree camera, this allows for simultaneous identification and recording of such evidence in the context of the whole environment. © 2018

Item Type: Article
Uncontrolled Keywords: MD Multidisciplinary
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Pharmacy & Biomolecular Sciences
Publisher: Elsevier
Date Deposited: 17 Sep 2018 08:15
Last Modified: 17 Sep 2018 08:20
DOI or Identification number: 10.1016/j.scijus.2018.07.004
URI: http://researchonline.ljmu.ac.uk/id/eprint/9229

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