Tag
hair drug testing
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How Far Back Does a Hair Test Go Back? The Science, Limits, and Hidden Truths
By the 1970s, scientists had begun experimenting with hair as a medium for drug detection, but the breakthrough came in 1988 when researchers at the University...
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How Far Can a Drug Test Go Back With Hair? The Science Behind Detection Limits
What makes hair testing uniquely powerful is its ability to map a timeline of drug use, like a biological ledger. Unlike urine or blood tests that capture only...
