Collecting DNA Evidence at Property Crimes
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Wet Stains on Nonabsorbent Surfaces

Home > 3. Evidence Collection > Wet Stains on Nonabsorbent Surfaces

Collection procedures for wet stains on nonabsorbent surfaces are as follows:

  • Use one or more 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.
  • Allow to thoroughly air-dry.
  • Collect the control sample by slightly moistening the swab with distilled water and rubbing an area of the surface in an unstained region near the stain.
Video camera

Click here for a video demonstration of swabbing blood evidence and collecting a control sample on a nonabsorbant surface.

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