Persistence of Biological Traces at Inside Parts of a Firearm From a Case of Multiple Familial Homicide

• NCJ Number: 246032
• Journal: Journal of Forensic Sciences Volume: 59 Issue: 4 Dated: July 2014 Pages: 1129-1132
• Author(s): Cornelius Courts Ph.D.; Britta Gahr M.D.; Burkhard Madea M.D.; Christian Schyma M.D.
• Date Published: July 2014
• Length: 4 pages
• Publication Format: Article
• Publication Type: Report (Study/Research)
• Language: English
• Country: United States of America

Annotation

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.

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. Abstract published by arrangement with Wiley.