Can't be done: To the best of my knowledge, there is no quick way to clear thc, the active drug in cannabis. This is a fat-soluble drug, which means it collects in body fat (and in the brain, which contains a lot of fatty compounds), and is released slowly into the bloodstream over time. Cannabis can be detected 3-4 weeks after the last use by the usual drug-screening tests, longer with hair sampling.
Answered 4/17/2016
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