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re: How precise are hair follicle tests?
Posted on 2/12/20 at 8:27 am to Texas ellessu
Posted on 2/12/20 at 8:27 am to Texas ellessu
quote:
6 - 9 months ago.
that's the time window that I've heard these tests can look back to
1
Posted on 2/12/20 at 9:31 am to 777Tiger
All scalp hair testing is based on assumption that each 1/2 inch is roughly equivalent to 30 days. Protocol is to collect at least an inch and a half from the scalp, If that is not possible then get hair from the the body. Usually the arm or leg is shaved and that is sent in. No one can really say how long the detection window is when you submit body hair. It is definitely a longer window than 1.5 inches of scalp hair.
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