i have been going to a pain clinic for my pain medication for four or five years. last year they popped a suprise urine drug test. i testd positive for marijuana as i use it every day for pain management. i have been substituting my boyfriends clean urine for subsiquent ua's. i have him take a couple of vicodin the afternoon or night before the test. so it tests positive for the vicodin and no marijuana. this has worked fine, but i am worried about a blood test. is there a detox for thc only? leaving the vicodin in my blood alone?