Is the best to use in the synthetic world of fake urine. I have used several types mostly from spectrum labs but have now moved to DR Greens, now dont get me wrong all have passed when tested. But now some labs have began to test for synthetics, and here in Oregon we have Legacy labs which is part of Legacy Health Systems or Hospital and they have began to test for synthetics and Agent X is the only one that can get past there machines so to eliminate all chances of the test getting snagged up in a legacy lab i use Agent X and Agent X only. passed a DOT physical for my school and now i have to use it for another test tuestday 9/14/2010 and ill get back to you when i get back from training or if i didnt get to go, but i doubt that will happen as Agent x works all the time everytime:jointsmile: