Crossword Genius

CSI stuff (3)

Ross

I believe the answer is:

dna

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

I've seen this clue in the LA Times.
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