it all depends on your metabolism and how much body fat you have. THC is actually stored in your fat cells. It also depends on how long ago you smoked those joints. If you're worried about a test, just quit smoking till that test, and the day of drink alot of water. I mean like one liter an hour and keep peeing to dilute the THC already in your urine. If you don't have much body and/or you have a high metabolism I wouldn't worry.