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Electrostatic sampling of trace DNA from clothing.

Martin Zieger1, Priscille Merciani Defaux2, Silvia Utz3

  • 1Institute of Forensic Medicine, Forensic Molecular Biology Department, University of Bern, Sulgenauweg 40, 3007, Bern, Switzerland. Martin.Zieger@irm.unibe.ch.

International Journal of Legal Medicine
|January 13, 2016
PubMed
Summary

A new electrostatic dust print lifter (DPL) shows promise for collecting trace DNA from clothing. While effective for single profiles, it struggles with mixed DNA samples compared to traditional swabbing methods.

Keywords:
ClothingElectrostaticSamplingTrace DNA

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Area of Science:

  • Forensic Science
  • Molecular Biology
  • Genetics

Background:

  • Physical aggression often results in trace DNA transfer onto clothing.
  • Current methods like tape-lifting and swabbing have limitations in efficiency and handling for non-destructive DNA sampling from garments.

Purpose of the Study:

  • To evaluate electrostatic devices as a novel method for collecting trace DNA from clothing.
  • To compare the efficacy of an electrostatic dust print lifter (DPL) against conventional wet swabbing for DNA recovery.

Main Methods:

  • Two commercially available electrostatic devices were tested on various fabric types.
  • Simulated physical aggression scenarios were used to assess DNA collection effectiveness.
  • DNA profiles were analyzed for single and mixed aggressor-victim samples.

Main Results:

  • The electrostatic dust print lifter (DPL) demonstrated comparable performance to wet cotton swabs for obtaining single DNA profiles suitable for database submission.
  • However, electrostatic sampling resulted in a significant loss of information, with very few mixed aggressor-victim profiles being established compared to swabbing.

Conclusions:

  • Electrostatic DNA sampling from clothing is a feasible proof-of-principle technique.
  • Further optimization is required before widespread adoption in forensic casework.
  • This method holds potential as an efficient and convenient tool for forensic practitioners in the future.