Just out of curiosity, does this apply to private schools as well? Sure they probably have their own rules, but would state/fed laws apply to them?
+1 on this. I can always spot people that are uncomfortable with their piece... "discreetly" adjusting it, glancing down at the area to check, etc. There was one at Wal Mart last night. Just don't worry about it, act normal, and you'll be fine.
On the subject of where you can/can't carry...
My rule is no metal detectors/pat downs = carry. So most fed. buildings, courthouses, etc. are a no-go, but other than that, I've got my gun on me. In metal detector/pat down places I carry other, more discreet weapons.