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OK... If you were just in the room and washed your hair you should be fine. The only reason it traces back so far is because it is stored in the center of the follicle. Therefore you can't wash it...

Don't know if he's had the follicle test or not. If not, that's not really enough to show up. THC can be detected for around 6 months. But just about all only go back about 120 days. They only you...