http://www.nhtsa.gov/people/injury/r...s/cannabis.htm

"Positive test results generally indicate use within 1-3 days; however, the detection window could be significantly longer following heavy, chronic, use. Following single doses of Marinol®, low levels of dronabinol metabolites have been detected for more than 5 weeks in urine"

Det testes vel strengt tatt ikke direkte for for THC heller, men metabolittene. Eller vimser jeg helt her?

Ellers er jo Erowid en fin side å lese på, f.eks denne teksten om akkurat dette temaet; http://www.erowid.org/plants/cannabi..._testing.shtml