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Transfer and persistence of DNA on the hands and the influence of activities performed

Szkuta, Bianca, Ballantyne, Kaye N. and van Oorschot, Roland A. H. 2017, Transfer and persistence of DNA on the hands and the influence of activities performed, Forensic science international: genetics, vol. 28, pp. 10-20, doi: 10.1016/j.fsigen.2017.01.006.

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Title Transfer and persistence of DNA on the hands and the influence of activities performed
Author(s) Szkuta, BiancaORCID iD for Szkuta, Bianca orcid.org/0000-0003-2272-5355
Ballantyne, Kaye N.
van Oorschot, Roland A. H.
Journal name Forensic science international: genetics
Volume number 28
Start page 10
End page 20
Total pages 11
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2017-05
ISSN 1872-4973
Keyword(s) forensic
DNA
transfer
handshake
activity
Summary During the evaluation of forensic DNA evidence in court proceedings, the emphasis previously placed on the source of the DNA is progressively shifting to the consideration of the activities resulting in its deposition. While direct contact and deposition may be a likely explanation, alternative scenarios involving DNA transfer through a secondary person or medium are important to consider. Here we assessed whether non-self DNA, indirectly transferred via a handshake, could be detected on surfaces contacted by the opposing hand-shaker after 15 min, and considered the variables affecting its persistence in subsequent contacts.In general, the depositor of the handprint was the major contributor to DNA profiles collected from handprints placed on glass plates. Minor contributions from the opposing hand-shaker (as a known contributor) were detected at a lower rate, decreasing as the number of contacted items increased post-handshake. Delays in deposition also affected the detection of the opposing hand-shaker, with a 15 min delay between handshaking and contact resulting in the reduced presence, and corresponding LRs, of the known contributor. The handprint depositor was excluded from their own handprint on several occasions, including instances where the opposing hand-shaker was not excluded from the same profile.Several factors appeared to strongly influence the detection of both the depositor and contributing individual involved in the handshake. The relative shedding ability of the pair had the largest effect, where good shedders (whether depositor or contributor) could swamp poor to moderate shedders, while the pairing of two moderate or two poor shedders could result in the detection of both individuals. When the deposition of a handprint was delayed, the activities performed by the individual had a substantial effect on the resultant detection of the contributing profile – multiple contacts with the same items increased the likelihood that the known contributor’s DNA would be retained and subsequently detected, through the parking and re-transfer of DNA on used items.
Language eng
DOI 10.1016/j.fsigen.2017.01.006
Field of Research 069901 Forensic Biology
06 Biological Sciences
01 Mathematical Sciences
18 Law And Legal Studies
Socio Economic Objective 970106 Expanding Knowledge in the Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2017, Elsevier
Persistent URL http://hdl.handle.net/10536/DRO/DU:30090792

Document type: Journal Article
Collection: School of Life and Environmental Sciences
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