Oh, and the whole "They can detect second hand smoke in hair" is total bullshit also. The hair stores cannibinoids deep within the folicle, not on the surface of the hair. Cannibnoids will wash out with normal shampoo (DO NOT waste your money on those "cleansing shampoos" They are a scam, just like most "pass a piss test" products) So you can hang out in a clam baked room a day before your hair test without fear.