Does psilocybin show up in a hair follicle drug test?
Technically between 3 to 5 months after use, but psilocybin is not usually tested for in standard (cannabis, cocaine, amphetamines, opiates, PCP) or advanced drugs tests (barbituriates, benzodiazepines like Valium). Found here http://www.thegooddrugsguide.com/mushrooms/faq.htm#02
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