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What Every Law Enforcement Officer Should Know About DNA Evidence

Investigators and Evidence Technicians

Physical vs Biological Evidence

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Image depicting handheld magnifying glass for Physical evidence and microscope for Biological evidence
National Institute of Justice (NIJ) (ver política de reutilización).

Physical evidence is any tangible object that can connect a suspect to a crime scene. Biological evidence, which contains DNA, is a type of physical evidence. However, biological evidence is not always visible to the naked eye.

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