Over 98% accurate (clinically studies confirmed that over 98% of those individuals with drugs present in their urine tested positive with the First Check test. We recommend all preliminary positive screening results be sent to the laboratory for free confidential confirmatory testing. Gas chromatography/mass spectrometry (GC/MS) is the gold standard in laboratory testing for most drugs. Confidential confirmatory testing is included in the purchase price of the First Check Home Drug Test). Results in 5 minutes. Contents: 1 first check drug test; 1 dropper; 1 instruction insert; 1 confirmation vial; 1 pre-addressed mailing box; 1 identification label; 1 plastic transportation bag; confidential confirmatory test included in purchase price. First Check offers a variety or home drug testing solutions, providing results in just 5 minutes for the possible use of marijuana. Drug: Marijuana; identifier - THC; street names - pot, grass, weed, dank, ganja, bud, hydro, zig zag. For in vitro diagnostic use. Made in China.