Some forensic evidence (3)
(Other definitions for dna that I've seen before include "It carries genetic information" , "Genetic-code molecule" , "Genetic profile" , "Genetic material often used by police" , "Substance in chromosomes that stores genetic information, used by police" .)
(Other definitions for hairs that I've seen before include "Threadlike growths" , "Fur filaments" , "See 3" , "eg Bristles" , "Skin growths" .)