Quote Originally Posted by thcbongman
Even if he doesn't, he should drink a lot of water, and piss a lot before the test. Then he should only give the middle-stream sample.
THC BM I personally like subbing but if you are into diluting, you should use a sports drink instead of just water because it will help keep the specific gravity of your sample up to help pass validity testing.

Dopefiend, what does it say at the bottom of your avatar, its to small to read. But you or your friend should check out the substitution thread for helpful hints and tips on pulling it off. For instance the range is 90-100 and not just 98. That makes it a little easier. Also, practice, practice, practice.