[wikithread]

If you only do pot use acetaminophens to screen the test.

Here's what you do:
1. Start of the day, start taking about 3 acetaminophens an hour (Tylenol, Tums, aspirin)
2. 2 hours before the test, drink Lots of water
3. Piss
4. Drink a lot more hour and hold it in until they test you.

Drinking vinegar doesn't work, it gives you a terrible stomache ache too. And yes, cranberry juice also helps.