Stop / go bald: The hair grows out an average of 1/2 inch/month and a heavy user will still have some THC in the blood for a month or more after stopping. As long as it is in your blood it may show up in new hair formed in that interval. If you go & stay bald there is nothing to test. You will need to abstain for months before it would not show up in your hair.
Answered 12/18/2017
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