text: *Shaking my furry skull* Noperz, the only guaranteed way to get a negative test is to not do the drugs. Especially pot as it will stay in your system for up to 30 days.\n\nNow mind you, there are things one can do to get false negatives, drinking lots of liquids, certain compounds sold on the market ect.\n\nProblem is, if the urine is too clear like drinking liquids will do, that is grounds for rejection and they will want another sample. With additives they test for that as soon as they become aware of the additive and then you fail for that.\nOften you are not left alone when the sample is given so cannot substitute for clean urine, dilute, or put in a negative creating chemical.\n\nWhich leaves one with the choice of before even giving the sample taking and informing the lab at collection time things like advil (for thc) which will result in a false positive even if you are clean. But at best you only delay your test.\n\nWhich gets us right back to must stay clean for the period of time it takes for the drugs to leave your system.\n\nMind you, you can do a search online for more info, but no one is gonna say "Oh gee they now test for our product." So buyer beware.