If a drugs test tests for Amphetamines and methamphetamines i know they will pick up on mdma, but will they also pick up mescaline and 2cb?

I don't know if you can say anything in general about this, since i don't know if the same tests are used everywhere. But i was tested for drugs once, about a week after i'd taken peyote and they didn't find anything.

Mesc can be tested for, but it's not tested for in standard tests and even extended tests. Whether or not it will throw a false positive for amphetamines, I can't seen to find an answer for. Even if it did, request a proof test for amphetamines and it will show negative unless you've recently used true amphetamines. In any case, a proof test will add some delay between use and test, and that means more of it out of your system! Unless they're doing a hair test.. hehe