Crime scene evidence (3)
(Other definitions for dna that I've seen before include "Initially, it stores genetic information" , "Genetic material often used by police" , "Deoxyribonucleic acid (abbreviation)" , "Substance that stores genetic information - often used by police" , "Briefly, substance in chromosomes used by police to identify criminals" .)
'crime scene evidence' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for prints that I've seen before include "Produces books" , "'Produces with ink, on paper say (6)'" , "Photographs" , "Stamps" , "Produces a paper copy of computer data" .)