Checking the validity of it isn't really the issue. A friend of mine told me recently that he failed a drug test using quick fix. He said he failed for marijuana. I thought how is that possible since he used fake piss. I thought of 2 possibilities this happened. Either he had weed residew on his hands and contaminated the nossle upon using it causing a false possitive.(He replied "No, there was nothing on my hands.") Or they could just tell he was a stoner. (He replied "Well i was really blazed when i took the test.") So That's what has me nervous about usuing it. Because i think it's my best choice to pass the urine test to move up from a temp job i just started to hired on full time. But don't yet have my 1st check to buy a new QF. Any thoughts? Is there a better way, less risky way to pass?