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What Every Law Enforcement Officer Should Know About DNA Evidence

Investigators and Evidence Technicians

Biological Evidence

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Image of officer touching evidence with hands overlaid with do not do symbol
National Institute of Justice (NIJ) (ver política de reutilización).

Biological evidence can be contaminated by an officer's own body fluids. Avoid direct or indirect contact with biological evidence. Anything you touch with ungloved hands can leave your skin cells behind, which can contaminate DNA evidence. Contamination may also extend to the instruments used for collecting evidence.

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