A member asked:

How long does thc stay in the hair . i've give up for 60 days . and my hair is inch long now?

5 doctors weighed in across 2 answers
Dr. Robert Killian answered

Specializes in General Practice

Hair Drug testing: Drugs you have consumed will be testable in hair samples. They do not leave or diminish. Only with haircuts does the previous exposures go away on testing. Hair testing is not like urine or blood testing.

Answered 6/28/2015

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Dr. Heidi Fowler answered

Specializes in Psychiatry

Hair follicle test: 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). --- It could be detected for months.

Answered 9/1/2019

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