Hair tests
Traces of drugs may accumulate in your hair after use. Hair testing can provide a history of your drug use because these traces may be present in your hair follicles. The length of your hair will determine how far back drugs might be traced (hair grows at approximately 1 centimetre per month). Hair testing is the only reliable method used at the moment that can detect drug use beyond a couple of days or weeks. Not many countries use this method, however, because of the cost and technology involved.
posted by Dr. Farm @ 9:26 PM
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