Drugs testing is eventually show up in your body fluids and hair in one form or another. So, you'll be asked to "donate" a sample of one of the two, which is submitted to a drug testing lab for chemical analysis.Because your hair grows, certain drugs can be detected for longer periods historically, but typically only for heavy-duty and continuous use. Hair analysis is the least invasive, but might not reveal recent use.Blood analysis is the most accurate, but pricey, definitely invasive, and not allowed in the Federal drug testing program at this writing.

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