The detection and persistence of Cannabis sativa DNA on skin

The presence of Cannabis sativa DNA was detected on the skin of persons who have recently handled both leaf and resinous material. The persistence of C. sativa DNA was examined on the skin. The subjects were asked to either r epeatedly rub their hands on their trousers, place their hands repeatedly i nto their pockets or wash their hands in soap and water. After rubbing the hands on trousers or placing them in pockets C. sativa DNA could still be d etected. No DNA could be detected after washing the hands.