I do know a little bit about AIT labs. They deal in trace detection of drugs. Their cutoff for THC is 20ng. Which is next to nothing. Opiate cutoff is 50ng. If you test positive for opiates at the 50ng on their instant test, it is then sent in to them and they break that down to see what you are taking. And they bring it down to a 20ng cutoff on the send it. Like oxycodone they will break that down and tell the quantitive amount and whether or not it is consistent or inconsistent. Inconsistent means that you did not list that med on your drug test form, but you tested positive for it. Consistent mean that you did list something like percocet and are legit in taking it. They also will break it down to oxymorphone in the quantitive consistent/ inconsistent. If you are taking something like codeine in the midst of all that, they can tell you took that also. They are very accurate. If you try and fool the test, they can check that too, but most labs can do that. They will go on specific gravity, ph, and creatinine in the urine. AIT labs is pretty amazing. What they can't tell is if you have been taking the medication as prescribed.