Most labs test for the NIDA 5 most commonly abused drugs: marijuana, amphetamines, opiates, cocaine, and PCP. Extended tests for barbituates, benzodiazapines, steroids etc., can be done by most labs also, but the standard test is just the NIDA 5.

I don't really know how pcp got on there because I was under the impression that it wasn't that common.

Anyway, shrooms can be tested for, but the test is very expensive. The only entity I know of that tests for them is the military. And with them, they only have one lab that does it. When you get tested in the military the lab your urine goes to rotates so most of the time it only gets the basic test. Anyway, thats probly more info than necessary.