CSI evidence (3)

I believe the answer is:

dna

(Other definitions for dna that I've seen before include "Genetic material often used by police" , "Genetic-code molecule" , "Briefly, substance in chromosomes used by police to identify criminals" , "Deoxyribonucleic acid (abbreviation)" , "Bodily substance that stores genetic information - police use it to identify" .)

I've seen this clue in the Newsday, The Wall Street Journal and the King Feature Syndicate.

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