This has already been said in another post but just wanted to let people know that if you plan on using quickfix 4.0 on a drug test, BE SURE to bring 2 containers of it with you for the lab screening. I took my test today and when I emptied the first container into the cup, it didn't make it up to the line! Thanks to Damon, i brought 2 with me, and I emptied half of the 2nd one into the cup. Granted, It could've been done with only 1/4 to 1/3 from the 2nd QF bottle (1/2 sent it over the line), but the first one DID NOT make it there. Anyway, I'll post again if I end up failing it, but for now i'm assuming I passed it without problems, and although QF is a little expensive (esp since you need two containers) it seems like a good way to pass a drug test if you can't use someone elses piss.