The ODV NarcoPouch Duquenois-Levine Reagent (Marijuana, 10 Pack) features presumptive drug testing Kits for all your presumptive testing situations. It consists of hermetically sealed ampoules prefilled with precise amounts of testing chemicals inside a plastic outer pouch. Small amounts of an unknown substance are loaded into the pouch, the ampoules are broken and the pouch agitated.
NarcoPouch tests show the color(s) of a positive reaction directly in front of the ampoule being broken. On multiple ampoule tests, color reactions are numbered to correspond to the order in which the ampoules are broken.