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A member asked:
When my hair follicle sample was taken for a drug test. the lady cut it from the bottom of my hair. is that normal?
A doctor has provided 1 answer
Yes: Hair sample drug testing is a way to measure up to a 90 day history of drug use. The proper procedure is to take approximately 100 hairs cut as close to the skin as possible. That way the most recent time frame is measured.
Answered 11/24/2013
4.7k views
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