hair drug use show up positive
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How long does it take for illegal drug use to show up in a persons hair?

Based on the average speed of head hair growth of one half inch every month it can take 4-5 days after drugs are used for the affected hair to grow to a length that can be sampled for drug testing.  Head hair samples taken within 4-5 days after drug use can detect if drugs have been used in the past 90 days.  This is an important drug test for pre-employment drug testing, as well as for random employee drug testing.

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