Presumptively detect the presence of Cocaine by simply wiping a Cocaine ID Swab over the suspected surface. If cocaine is present, the swipe will turn blue. Swipes have an unlimited shelf life insuring reliable results. Great for use by narcotics agents in the field and investigators at the crime scene. A forensic laboratory is required to qualitatively identify an unknown substance before a positive identification can be made. For use by fully trained law enforcement professionals only.