OTC HAIR test for illicit drugs, PDT-90

    You'll also see an OTC HAIR test for illicit drugs, PDT-90. It's being stocked now by Walgreens and Eckerds.

    Hair testing is more likely to detect occasional drug use.

    Urine tests only detect drug use in the past 3 to 4 DAYS... hair tests can detect drug use during the past 3 MONTHS.

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