A 49-year-old member asked:
how long does thc stay in your hair?
2 doctor answers
Dr. Heidi Fowler answered
24 years experience Psychiatry
It may be detected: In hair follicles for months. In “pharmacokinetics of cannabinoids” by mcgilveray ij it is stated “hair tests are more likely to detect regular than occasional marijuana use. One study found that 85% of daily users tested positive for marijuana, versus 52% of occasional smokers (1-5 times per week).
Answered on May 18, 2020
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