Crossword Genius

Forensic evidence (3)

Ross

I believe the answer is:

dna

(Other definitions for dna that I've seen before include "Substance in chromosomes that stores genetic data" , "Genetic-code molecule" , "Genetic material often used by police" , "Initially, it stores genetic information" , "Substance in chromosomes that stores genetic information, used by police" .)

I've seen this clue in the LA Times.
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