Not sure if this helps but i just had to take a pre-employment drug screen at a hospital myself. I knew that I would definitely not pass since i had been smoking regularly and i didnt have enough time to get clean, so i substituted with Quick Fix 4.0. Obviously the screen was not observed (which i wasn't sure would be the case prior). Needless to say, i was nervous as hell, but i just got word that i passed with flying colors thanks to the Quick Fix! This was the first drug screen i have ever had to take in my life. Not sure if the fact that you were previously failed will impact whether or not you will be observed, but i would doubt it. I can say with a good deal of confidence that if, in fact, you are able to sub with Quick Fix, you will definitely pass.