How long does a hair drug test go back?

Answer

A hair drug test goes back seven years. That is what I have heard from other people that has had it done.But it can go back for ten years that is because your hair grows all the time.
Q&A Related to "How long does a hair drug test go back?"
It depends on the drug that the test is engineered to detect. Drug use other than prescription medication that has been prescribed to you is illegal.
http://answers.ask.com/Health/Addictions/how_far_b...
Depends on purpose of test, and how long hair is. Typically, about 90 days, more or less (for employment)
http://wiki.answers.com/Q/How_long_back_do_hair_dr...
Hair follicle drug tests are an easy way to test for drugs, and these tests can detect drug use over a far longer span of time than other methods of testing for drugs. From the time
http://www.ehow.com/about_5032061_far-hair-follicl...
Hair sample testing can detect drug use for up to 90 days after use...
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