Quote Originally Posted by Burnt Toast
In what manner?

Please elaborate..
Well again, I have no basis for this viewpoint since I have not used QF 5.7, but just by reading other boards about it, there are more than a few posts about Concentra failing people who used it. The tests seem to point to the lack of uric acid and other non human qualities. I guess there are cases where the uric acid including in the kit did not fool Concentra. Three years ago, I used 4.0 with success, so my own experiences with the product are good.

I just do not want to risk it personally. Even if there is a shadow of a doubt about whether it will pass, I cannot risk it personally. And I am little mortified by users reporting that it didnt pass.