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A 24-year-old female asked:

is it possible to pass a hair drug test for thc?

2 doctor answers3 doctors weighed in
Dr. Robert Killian
General Practice 28 years experience
THC and Drug Tests: Nope. Unless you have not inhaled or ingested any thc ever. If the drug is used it will be your hair until that level of hair has grown out and you cut it off.
Dr. Heidi Fowler
Psychiatry 25 years experience
Possibly: 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).

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Last updated Sep 4, 2019
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