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Research Article| Volume 3, ISSUE 4, P242-250, September 2009

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Development of STR profiles from firearms and fired cartridge cases

  • Katie M. Horsman-Hall
    Affiliations
    Virginia Department of Forensic Science, 700 N. 5th Street, Richmond, VA 23219, United States
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  • Author Footnotes
    1 Current address: New York Office of the Chief Medical Examiner, Department of Forensic Biology, 421 E. 26th Street, New York, NY 10016, United States.
    Yvette Orihuela
    Footnotes
    1 Current address: New York Office of the Chief Medical Examiner, Department of Forensic Biology, 421 E. 26th Street, New York, NY 10016, United States.
    Affiliations
    Virginia Commonwealth University, Forensic Science Department, PO Box 843079, Richmond, VA 23284-3079, United States
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  • Author Footnotes
    2 Current address: Washington State Patrol Crime Laboratory, 2203 Airport Way S, Suite 250, Seattle, WA 98134, United States.
    Stephanie L. Karczynski
    Footnotes
    2 Current address: Washington State Patrol Crime Laboratory, 2203 Airport Way S, Suite 250, Seattle, WA 98134, United States.
    Affiliations
    Virginia Commonwealth University, Forensic Science Department, PO Box 843079, Richmond, VA 23284-3079, United States
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  • Ann L. Davis
    Affiliations
    Virginia Department of Forensic Science, 700 N. 5th Street, Richmond, VA 23219, United States
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  • Jeffrey D. Ban
    Affiliations
    Virginia Department of Forensic Science, 700 N. 5th Street, Richmond, VA 23219, United States
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  • Susan A. Greenspoon
    Correspondence
    Corresponding author. Tel.: +1 804 786 4707x20456; fax: +1 804 786 9985.
    Affiliations
    Virginia Department of Forensic Science, 700 N. 5th Street, Richmond, VA 23219, United States
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  • Author Footnotes
    1 Current address: New York Office of the Chief Medical Examiner, Department of Forensic Biology, 421 E. 26th Street, New York, NY 10016, United States.
    2 Current address: Washington State Patrol Crime Laboratory, 2203 Airport Way S, Suite 250, Seattle, WA 98134, United States.

      Abstract

      Fired cartridge cases are a common type of evidence found at crime scenes. However, due to the high chamber temperatures and touch nature of this evidence, DNA testing is not commonly sought because it is believed DNA is only present in low levels, whether it is due to initial low levels of DNA and/or DNA degradation from the heat or inhibition of the PCR reaction. Moreover, very few laboratories report STR typing success with fired cases. This study focused on obtaining STR profiles from fired cartridge cases using the AmpFℓSTR® MiniFiler™ kit, which is designed to amplify DNA from low level, inhibited, and degraded samples. Comparisons to other STR amplification kits were also conducted. In attempt to simulate casework, random individuals loaded cartridges into a firearm. DNA was recovered from the fired cartridge cases using the double swab technique and extracted using an automated large volume DNA IQ™ method. Initially, testing focused on known shedders handling cartridges for 30 s prior to firing. A significantly greater number of alleles was obtained following amplification with the MiniFiler™ kit versus the PowerPlex® 16 BIO kit. No alleles were observed using the Identifiler® kit. In an attempt to better simulate casework, a random selection of laboratory personnel handled shotshells for as long as needed to load and fire the weapon. In this mock sample study, the MiniFiler™ kit successfully amplified an average of 22% of expected alleles from DNA recovered from shotshell cases versus the PowerPlex® 16 BIO kit where an average of 7% of alleles were observed. However, the total number of alleles obtained from the two kits was not significantly different. The quality of the DNA obtained from fired cases was studied with evidence of inhibition in at least 11% of shotshell case samples. After swabbing the head and the hull of three shotshell cases separately, a significantly greater number of alleles was obtained from the hull as opposed to the head of the fired shotshell case. In addition, after firing, various internal firearm surfaces were swabbed, including the chamber of barrel, ejection port, and breechface, in an attempt to obtain amplifiable DNA. DNA was obtained from the chamber of the barrel and was amplifiable using the MiniFiler™ kit, although mixtures were obtained with extensive drop-in and drop-out making this analysis unlikely to aid an investigation.

      Keywords

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