Could Secondary DNA Transfer Falsely Place Someone at the Scene of a Crime?

Journal of Forensic Sciences
Cynthia M CaleGay L Bush

Abstract

The occurrence of secondary DNA transfer has been previously established. However, the transfer of DNA through an intermediary has not been revisited with more sensitive current technologies implemented to increase the likelihood of obtaining results from low-template/low-quality samples. This study evaluated whether this increased sensitivity could lead to the detection of interpretable secondary DNA transfer profiles. After two minutes of hand to hand contact, participants immediately handled assigned knives. Swabbings of the knives with detectable amounts of DNA were amplified with the Identifiler(®) Plus Amplification Kit and injected on a 3130xl. DNA typing results indicated that secondary DNA transfer was detected in 85% of the samples. In five samples, the secondary contributor was either the only contributor or the major contributor identified despite never coming into direct contact with the knife. This study demonstrates the risk of assuming that DNA recovered from an object resulted from direct contact.

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Citations

Oct 23, 2016·Forensic Science International. Genetics·Alycia K BuckinghamRoland A H van Oorschot
Sep 14, 2016·Journal of Forensic Sciences·Cynthia M Cale, Krista E Latham
Sep 14, 2016·Journal of Forensic Sciences·Cynthia M CaleGay L Bush
Jan 28, 2017·Forensic Science International. Genetics·Bianca SzkutaRoland A H van Oorschot
Nov 17, 2017·International Journal of Legal Medicine·Travis RuanDavid Bruce
May 26, 2018·Journal of Forensic Sciences·Zuhaib SubhaniNunzianda Frascione
Mar 28, 2019·Forensic Sciences Research·Krista E Latham, Jessica J Miller
Feb 19, 2017·International Journal of Legal Medicine·Céline M Pfeifer, Peter Wiegand
Jan 2, 2021·Forensic Science International : Synergy·John M Butler, Sheila Willis
Mar 12, 2021·Journal of Medical Entomology·David B RiversKayleen Melvin
Jun 4, 2021·Electrophoresis·Julia BurrillNunzianda Frascione
Jun 11, 2021·Forensic Science International. Genetics·Margot De SmetBram Bekaert
Sep 18, 2017··Veronica ScottiAlessandro Ferrero

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