You just copy and paste from the address bar, shortwave...
http://www.huffingtonpost.com/2013/01/15/guns-in-schools-firearms-_n_2482168.html
http://investigations.nbcnews.com/_...chools-with-little-restriction-in-many-states
Yep, 18 or more states do not have laws specifically disallowing carry in schools. Connecticut is one of them and was in place when Lanza shot up Newtown. Why weren't those teachers self armed? How many tried to petition the proper authorities to make that happen? Where is the outrage from those teachers that they could have prevented the attack but weren't allowed?
That is the real problem with this notion that volunteer, random, self armed teachers are going to be protecting our children. Teachers seem no better than the general US population or vast majority of concealed carry gun owners who somehow manage to not carry on a regular basis.
Sorry, but it is absolutely ridiculous to expect random self armed teachers with no training to stop school shooters. Unless they are required to be trained and required to carry, you can't count on them even having a gun with them just like you can't count on the vast majority of CCW people to be armed when they are out and about.
So yeah, 18 or more states and yet do you know of any examples of where said untrained teachers in those states have secured permission and stopped a shooting? How about the lists of protests or complaints to the NRA by teachers in those states to help encourage schools or districts to allow them to carry, because as you point out, it is legal. It can be done.
If the teachers aren't behind it, then our yammering out it is pretty pointless. There is no evidence that the Newtown teachers were trying to get permission or had even put in requests to carry before the shooting.