How Accurate Are Drug Tests?

Drug tests are used by employers and law enforcement alike, but are they foolproof?

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Hair Drug Testing - Facts and Myths (Health Street)
"If you need a hair drug test, first you need the facts: how far back does it go? What drugs can be detected? Body hair vs. head hair vs. no hair at all."

What Is a Urine Drug Test? (Healthline)
"A urine drug test, also known as a urine drug screen or a UDS, is quick and painless. It tests your urine for the presence of certain illegal drugs and prescription medications."