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Your hair is the best way for the LAB to understand what kind of stuff you've take from 3 to 6 months back. The THC (active marijuana ingredient) is stored in your hair follicles and it's possible the drug to be detected up to three years after the last time you smoke. Usually LAB require a sample of hair that is about 1.5inches and from 90 to 120 strands, depending on how thick or coarse the hairs are. Human hair grows an average of .5 inches/month, which corresponds to 30 days (1.5 inches/ 90 days back). You can go and search for any cleansing and masking stuff, but they will not clean your body, they will just mask it and they work 50% of the time.

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13y ago
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Q: How can you pass a THC test by the hair?
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