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For light users (cannabis use weekly or less often):
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it is detectable for an average of 13 days with a range of 3-29 days. Due to the individual variations, substantial overlap occurs in the ranges observed. As explained in the multicompartment model for THC, THC is sequestered in tissues (deep compartment), and the rate of elimination of THC from the body is limited by the slow release of THC from this “tissue compartment.” As substantial amounts of THC can be accumulated in tissues for chronic users, considerably long times are required to eliminate it. Consequently, a positive analysis for THC metabolite in urine at these concentration levels may indicate last time marijuana use of a few hours to as much as a few weeks previously.
Assuming that screening assays of 50 ng/ml cutoff and confirmation assays for 9-carboxy-THC of about 10-15 ng/ml are used, urine samples will generally be positive for 1 to 3 days.