I had a friend fail using this method. But he might not have done it right. The directions were to wake up. Drink lots of water and try to piss a couple of time before your test. Then get the Knox geletin packets (2 in a box). Mix the two packets in two cups of water. Drink the nasty shit and dont piss until your test. You have about 2 hours or so to piss but give the stuff about 30-45 minutes to work. You might even want to take a vitamin to add color to your piss. I passed with this method but I didnt smoke for like 3 weeks before the test. Some people swore by this method. Supposably they even tested it using companies tests like Qwest, etc...