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What Every Law Enforcement Officer Should Know About DNA Evidence

Investigators and Evidence Technicians

Collection Procedures for Dried Saliva

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Image of cigarettes in ashtray
National Institute of Justice (NIJ) (see reuse policy).

Special collection procedures for dried saliva:

  • Cigarette filters and envelopes should NOT be handled with bare hands in order to avoid contamination. To prevent contamination of the evidence with your own DNA, always wear gloves when coming into contact with anything at a crime scene.

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