my dad mulitiple slipped disc in his back. so for the past 6 yrs he's had issue after issue with workers comp, doctors, just more than any one should. Well things were finally lookin up for him and he had a great doctor. he was perscribed percocets. he takes them as he was told. well when they did a blood and urine test it did not show up and he "FAILED" his drug tests. They said it didnt show up. So they gave him the boot. A yr later he got a new doctor and the same thing is happening to him again.. The problem is he's taking as perscribed and all the other drug tests he has passed. We think there is something up with the doctors and the workers comp people. Is there any reason this would be happening. I mean the drug not showing up in the drug tests. If anyone had any helful information please let me know!!!!!!!