I know this is an old thread but out of all the research I did on Dr Greens Agent X I have not found where it faled. I screwed up 2 other tests and have a potential new boss that is a saint and is letting me test for a 3rd time. I am using Dr G's and shouldn't have a problem. I will post my results Friday to let you all know. I am going to practive though tonight as I am going in first thing in the morning.