http://www.craigmedical.com/Hair_Drug_Te...
http://en.wikipedia.org/wiki/Drug_Testin...
http://www.erowid.org/psychoactives/test...
they can detect drug use up to three months (sometimes different for different drugs - see the last link which includes a chart)
Drug test Detction times in Hair testing?
usually about 3 months.
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