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What Every Law Enforcement Officer Should Know About DNA Evidence

Investigators and Evidence Technicians

Non-absorbent Surface Procedures

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Collection procedures for wet stains on non-absorbent surfaces are:

  • Use one or more clean sterile swabs (or sterile gauze for larger stains) to soak up the stain
  • Concentrate the stain on one portion of the tip of the swab (the swab stick may be wooden or plastic)

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