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Dr. Andrew Rynne
MD
Dr. Andrew Rynne

Family Physician

Exp 50 years

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Can My Hair Follicle Drug Test Prove My Pot Smoking?

I stopped smoking pot just over a month ago. I recently passed a urinalysis over one week ago. I have a hair follicle drug test looming maybe in about a week or so. I have cut my hair to 1/2" tapered to about 1/8" at my neck line. Will my hair pass the test?
Fri, 6 Feb 2015
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Addiction Medicine Specialist,  's  Response
tricky. I don't think there's an answer on this one. If you were a heavy pot smoker before quitting then no, you will be positive at one month on urine and certainly on hair. BUT the urine being negative implies that you were not a heavy marijuana user. That's 2-3 weeks urine would be clean at the time of the hair test. If it was one joint just over a month ago, I don't think you can say one way or the other. Half an inch a month would be probably negative but one inch goes back to 2 months when you were still using marijuana. You say the hair length is somewhat inbetween the two......
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Can My Hair Follicle Drug Test Prove My Pot Smoking?

tricky. I don t think there s an answer on this one. If you were a heavy pot smoker before quitting then no, you will be positive at one month on urine and certainly on hair. BUT the urine being negative implies that you were not a heavy marijuana user. That s 2-3 weeks urine would be clean at the time of the hair test. If it was one joint just over a month ago, I don t think you can say one way or the other. Half an inch a month would be probably negative but one inch goes back to 2 months when you were still using marijuana. You say the hair length is somewhat inbetween the two......