whether it's possible to test positive for illegal drugs without taking one

People often ask whether it's possible to test positive for illegal drugs without taking one.

The answer is yes...at least on urine SCREENING drug tests.

For example, pseudoephedrine can look like an amphetamine on a screening test...venlafaxine and diphenhydramine can look like PCP...or NSAIDs (ibuprofen, etc) and PPIs (Nexium, etc) can look like marijuana.

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