Crossword Genius

Strands in a lab (3)

Ross

I believe the answer is:

dna

(Other definitions for dna that I've seen before include "Genetic material often used by police" , "Bodily substance that stores genetic information - police use it to identify" , "Main constituent of chromosomes" , "Briefly, substance in chromosomes used by police to identify criminals" , "Substance in chromosomes that stores genetic data" .)

I've seen this clue in the New York Times, the Newsday.com, the LA Times, the Wall Street Journal and The Washington Post.
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