Which are the best in-store THC detox kits?

Don't waste your money on this **** none of it works. The best way to get THC out of your blood stream is by drinking cranberry juice or eating oranges. Although these methods will only speed the process up by a few days it still will help you. Assuming you did not use anything and you had an upcoming drug test the shortest amount of time you would have to lay of the dope would be 28 days, however if you are a hardcore chronic it would probably take at least 2 weeks longer than that.