I don't know what you people are talking about. Being clear has NOTHING to do with it. I recently had a test which I had a month to prepare for. I stopped smoking for 25 days and drank 3 gallons of water a day for the 25 days, I went to my local pharmacy for an at home drug test and failed it. 3 GALLONS OF WATER A DAY FOR 25 DAYS and I didn't even pass a 10 dollar home test. With 2 days left I ordered synthetic urine and passed no problem. I could've smoked the whole time. Since then I carry one at work for those special occasions. Only way to be safe is with clean piss, simple as that. I hate to say it, but I think you are screwed.