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What Every Law Enforcement Officer Should Know About DNA Evidence

Investigators and Evidence Technicians

Cross Contamination

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Image of evidence wrapped in paper
National Institute of Justice (NIJ) (see reuse policy).

Remember that wet and dried evidence should not be folded on itself. Use paper to wrap the item. This will protect bloodstain patterns and prevent cross-contamination between stains. Use paper wrapping to prevent contamination during the packaging process.

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