Touch DNA Evidence

A DNA profile may be obtained by swabbing items thought to have been handled by a suspect, even in the absence of visible evidence. The ability to preserve and obtain this touch DNA evidence has evolved and been recognized over recent years.

Laboratory protocol will dictate who will collect this evidence. Firearm, latent print, or DNA examiners may have responsibility for collection. Regardless of who collects the evidence, the firearm or item to be swabbed should be handled with gloves prior to and during swabbing for potential touch DNA evidence.

Touch DNA evidence may be obtained from a firearm handled by a suspected shooter. Surfaces of the firearms that may be swabbed include slide serrations, serrated triggers, hammers, grips, magazine releases, and safety levers. The DNA swabs are preserved and packaged for later testing, if required.

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