A member asked:

If you smoked marijuana how long will it stay in your body hairs & it's been a year already & i have not shaved my hair how long will it stay for?

A doctor has provided 1 answer
Dr. Robert Killian answered

Specializes in General Practice

Hair and Drugs: Hair records all kinds of information. It is there forever until you cut your hair. All the hair will confirm is that you used marijuana in the past. You need a haircut.

Answered 4/5/2013

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If smoked once how long will marijuana stay in your hair?

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