Urine testing is probably the most common drug testing procedure used today. Drugs, in order to be detected in the urine must be absorbed, circulated in the blood and deposited in the bladder. This process takes approximately three hours for most drugs--except alcohol--- which can take only 30 minutes. Thus, an individual who was tested just 15 or 20 minutes after using drugs would probably (but not always) test negative unless he was a chronic user who would have identifiable drug residue in his/her urine at all times. Chronic users of marijuana, for example, may test positive for marijuana use several months after use of the drug.
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