If your ABSOLUTELY sure your friend is clean his will work fine. If the advil happens to hit positive its no big thing. It'll show up as advil in the confirmation test. Lots of substances hit false positives, they just get sent to GC/MS to confirm what they are.
killerweed420 Reviewed by killerweed420 on . Subbing Dilemma... I've been reading hundreds of posts about beating the test and I realized that subbing is by far the best option, as quitting for even 2 months won't guarantee a clean sample for a daily smoker. I have a dilemma for which type of sample to bring to the test though. A friend of mine who is clean has agreed to give me his sample, but he takes Advil/Tylenol a few times a week so I am concerned that this may set off a false positive. On the other hand, I still have 10+ days until my test, Rating: 5