Persistence of Biological Traces at Inside Parts of a Firearm from a Case of Multiple Familial Homicide |
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Authors: | Cornelius Courts Ph.D. Britta Gahr M.D. Burkhard Madea M.D. Christian Schyma M.D. |
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Affiliation: | 1. Institute of Legal Medicine, University of Bonn, , 53111 Bonn, Germany;2. Institute of Legal Medicine, University of Düsseldorf, , Moorenstrasse 5, 40225 Düsseldorf, Germany;3. Institute of Legal Medicine, University of Bern, , Bülstrasse 20, Bern 3012, Switzerland |
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Abstract: | Backspatter from wounds caused by contact shots against a biological target had before been shown to be propelled into firearms' barrels where they can persist and be retrieved from as relevant forensic evidence. Herein, that insight was applied to the investigation of a case of multiple familial homicide with a firearm. Samples of backspatter were collected from the firearm using DNA‐free swabs. DNA was extracted from the swabs, and 16 STR systems were PCR‐amplified to generate DNA profiles of all victims shot by the firearm. The quality of the resulting DNA profiles was sufficient to exclude the perpetrator as donor and to differentiate the three closely related victims thereby proving that all three victims had been shot by the same firearm from very close or contact distance. A key insight gained from this case was that not only a firearms' barrel inside but other inner surfaces may be charged with profilable DNA. |
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Keywords: | forensic science forensic ballistics forensic genetics firearms homicide trace DNA |
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