Hello I was wondering just how the hair test works. If I smoke for the first time in my life and have short hair how long will it take for the new hairs growing out of my scalp to not have any thc in them? I've read it takes 90 days for new hairs to not show any thc but I was looking for a confirmation. I've only smoked once but want to know at what point should I start cutting my hair. Thanks.
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replied August 23rd, 2010
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I think it is 90 days but not sure. Anyone else know?

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