How do you pass urnine test for meth?

By staying clean.

Seriously, modern drug test also test wether the urine is that of a healthy, adult (or adolescent) human*. Any proposed method for accelerating detox either does not work or changes the levels of normal urine-components as electrolytes, urea, hormones etc. - which will produce an 'invalid' test. That in turn is mostly considered suspicious and you will have to redo the test, maybe even stay at the test-site for several hours under supervision before you do. In fact most 'detox-accelerators' are far more dangerous than the drug.

*"Mr. Doe, the drug test says you are clean - a clean, pregnant goat, as a matter of fact."

Additionally, any information passed on to assist in avoiding detection is likely to be illegal, and WikiAnswers does not provide illegal how-to information.