I called in to request information about a false positive for cocaine on a friend's hair test. woman was flippant and rude stating "we don't make mistakes." I'm not naive, I know they must get 1000s of "it wasn't me" calls but to have to argue just to figure out what she should do next is ridiculous. there must be a procedure to follow when something like this happens. if there is, I never found out what it is because she was too busy telling me about their perfection to even consider a mistake might have been made.