- 1: Types of Evidence
- 2: Types of Crime Scenes
- 3: Evidence Collection
- Collection Priority
- Control Samples
- Reference Sample Collection
- Equipment
- Procedures
- Biological Evidence Packaging
- Blood and Body Fluid Collection
- Hair and Fiber
- Wet Stains on Absorbent Surfaces
- Special Situations
- Wet Stains on Nonabsorbent Surfaces
- Dry Stains on Absorbent Surfaces
- Dry Stains on Nonabsorbent Surfaces
- Collecting a Sample From a Smear
- Evidence Marking
- Packaging for Transport
- Chain of Custody
- Preserving Evidence
- Reporting
- Testifying
- Summary
- 04: CODIS
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.
Click here for a video demonstration of swabbing blood evidence and collecting a control sample on a nonabsorbant surface. Flash Plugin Required
