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A male asked:

Have abstained from drugs 30+ days, have a hair follicle test, was a light but daily user of marijuana (1 gram per 6 days), what are my chances?

1 doctor answer1 doctor weighed in
Dr. James Ferguson
Pediatrics 48 years experience
Depends: Hair grows at varying rates among different racial groups. The average is about a half inch per month. If your hair is more than a half inch long they will likely find traces of drug along the shaft if the test is specific enough.
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Last updated Jun 9, 2016


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