What is a guaranteed method to pass a drug test when you have meth in your system?

One way only: There's only one way to pass a drug test -- and that's to not use meth or any other illicit substance at all. You've now had the same free advice from 3 different physicians (so far). I hope you take it in and use it.

There is none: Please stop using meth. The stories you have heard of users tearing the flesh from their bones before they die are true.