How long does marijauna stay in your system, and when you have to do a hair analysis test how long does it stay in your hair folicle?
by 
Anonymous
ANSWERS: 3
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up to 90 days I believe
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It stays in your hair until you cut it. Your hair grows an average of half an inch a month. They can give an approximate time of when you last smoked just by where they test on the sample. I speak from experience, I am not making this up.
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After the three month period it should be out of the system, but the hair exam is tricky. I was told that they clip very close to the scalp so the folicle should be clean of it.
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