Gunshot residue preservation in seawater

Anne-Christine Lindstrom, Jurian HOOGEWERFF, Josie Athens, Zuzana Obertova, Warwick Duncan, Neil Waddell, Jules Kieser

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    Abstract

    Little is known about the persistence of gunshot residue (GSR) in soft tissue and bones during decomposition in marine environments. For a better understanding, qualitative and quantitative data were obtained on GSR retention on soft tissue and bony gunshot wounds (GSWs). A quantity of 36 fleshed and 36 defleshed bovine ribs were shot at contact range with 0.22 calibre hollow point ammunition using a Stirling 0.22 calibre long rifle. Bone specimens in triplicate were placed in three environments: submerged, intertidal and in supralittoral zone. Sets of triplicates were recovered on day 3, 10, 24 and 38, and analysed with scanning electron microscopy with energy dispersive X-ray spectrometry (SEM-EDX), and inductive coupled plasma mass spectrometry (ICP-MS). The SEM-EDX recorded GSR-indicative particles surrounding the bullet entrance on all bone types (fleshed and defleshed) in all environments throughout the study. GSR-unique particles were only detected on the supralittoral bones. The ICP-MS analysis showed faster GSR loss on submerged than intertidal and supralittoral defleshed specimens. Fleshed specimens showed a faster GSR loss on intertidal than submerged and supralittoral specimens. In conclusion, the GSR disappeared faster from submerged and intertidal than non-submerged specimens. The difference of detection of GSR between analysed specimens (defleshed versus fleshed) disappeared upon defleshing. This study highlights the potential of finding evidence of GSR in a submerged body and the potential of microscopic and analytical methods for examining suspected GSW in highly decomposed bodies in marine habitats.
    Original languageEnglish
    Pages (from-to)103-111
    Number of pages9
    JournalForensic Science International
    Volume253
    DOIs
    Publication statusPublished - Aug 2015

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    Lindstrom, A-C., HOOGEWERFF, J., Athens, J., Obertova, Z., Duncan, W., Waddell, N., & Kieser, J. (2015). Gunshot residue preservation in seawater. Forensic Science International, 253, 103-111. https://doi.org/10.1016/j.forsciint.2015.05.021