NIK® Presumptive Drug Tests Crime laboratories are so busy that drug tests take too long. With the cooperation of the Prosecuting Attorney, many police agencies have turned to presumptive drug testing. If the results indicate that an illegal substance is present, criminal charges may be filed. The NIK® Pouches contain one, two or three chemical ampoules in a heavy-duty plastic pouch. This eliminates the need for measuring, mixing and dispensing of reagents. Just place a small sample of the suspected drug in the pouch, break the ampoules and watch for the color change. A positive color indicator on the pouch will help to interpret the reaction. Reagent shelf life is indefinite. Prolonged exposure to strong sunlight or heat should be avoided. This product cannot ship to military APO address. A physical address that can accept Fed Ex or UPS shipments is required