Here's something you may want to consider if your a family man with money in the bank to spare. Find a local lab that you can go into before your mandated test and get a discrete lab test of the Exact same variety. Make sure they know you want one correlating to that notation you used. It could cost you a pretty penny, $40 and up from what I understand near here, but could be worth letting you know whether or not you need to substitute, which can be risky. Read 8 days to pass, theres a drug test horror story, poor guy. Also, I know the $15 tests at wal-greens have the option of sending the pee in if it turns up non-negative, but I dont know exactly the time-line/ reliability on that. If this test determines stuff in your life that you Dont want messed up, a lab test could be a good way to have some confidence.