I play ncaa football, and sadly there is few ways to pass a piss test besides, a replacing urine in your bladder, and this is dangerous and you need a doctor to do this, if you try to do this ur crazy. Clen is out of you in few days. And I have been tested 4 times, and everytime the guy watchs the piss come out of you, so dont bother trying to buy and devices, its pointless. Go to a doctor, by sterile powder urine, and tell him if you dont do it I will, and see what he says, most likely know, but its your best bet if ur dealing with ncaa. I dont want to tell anyone to do any of this but i know to many people that have been in your shoes.