Drug tests DO NOT test for THC. THC is out of the blood about 2 -4 hours after smoking. Drug tests test for the by-product, the cannabinols and cannabinoids still in your blood, piss, hair, and fat cells.
LIP Reviewed by LIP on . Light, moderate or heavy smoker? Hi all; Though I'm new to this site, I have been a regular smoker now for about 15 years. Just to start off, I was on the NORML site and read an article dated in 2006 that quoted industry professionals stating that even for heavy users, as a result of changes in testing methods, that THC can only be detected for approx 10 days after being clean. Given of course there are always the factors of metabolism, frequency of use and THC content, this seems to bode well for those concerned. Will Rating: 5