en
Scientific article
English

DNA profiling success and relevance of 1739 contact stains from caseworks

Published inForensic science international. Genetics supplement series, vol. 1, no. 1, p. 405-407
Publication date2008
Abstract

Contact stains collected on handled objects, touched surfaces or worn clothes typically contain minute amounts of DNA and are therefore less exploited than other stains, such as those containing saliva or blood. In this study 1739 contact traces from real casework were analyzed to determine their analysis success rate and relevance to the case. More DNA was recovered when stains were collected with the double swab technique (mean [DNA] of 0.494 ng/μl), rather than with single swabs (mean [DNA] of 0.312 ng/μl). After being amplified with the SGM Plus STR multiplex kit, 26% of the contact stains had DNA profiles suitable for the Swiss DNA database. Out of the 398 DNA profiles sent to the DNA database, 49 matched crime scene DNA profiles and 136 matched DNA profiles from individuals, including one policeman. These results confirm that, when carefully collected, analyzed and interpreted, contact stains have a high potential to help solving crimes.

Keywords
  • Contact stain
  • LCN analyses
  • Double swab
  • Evidence collection
  • STR
Citation (ISO format)
CASTELLA, Vincent, MANGIN, Patrice. DNA profiling success and relevance of 1739 contact stains from caseworks. In: Forensic science international. Genetics supplement series, 2008, vol. 1, n° 1, p. 405–407. doi: 10.1016/j.fsigss.2007.10.071
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ISSN of the journal1875-175X
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