I would use a substitute (even though the whole temperature of the urine stuff worries me) if they didn't stand right behind me while I'm doing the test. I'm going to be testing myself after I use the stuff from GNC I just need to know what to buy since they don't have any kits that simply say "Clean your system of marijuana" I have no clue what to purchase.

I've found this page passyourdrugtest.com but don't understand why someone would buy a more expensive kit that takes longer to finish. I want to buy the $75 kit from there but how do I know the site isn't a scam or something..