Teachers with Tommy guns
The GOP candidate running against Lindsay Graham in South Carolina explains why you cannot stop teachers from carrying guns in school:
COLMES: So [teachers] shouldn’t have machine guns?
BRIGHT: I would think a teacher protecting a school grounds should be able to carry whatever she can carry legally.
COLMES: So should machine guns be legal to carry?
BRIGHT: The Second Amendment is pretty clear. It says the right to carry arms should not be infringed. [...]
COLMES: So you should be able to have any gun you want?
BRIGHT: Well, I don’t see how the government can regulate it.
Since public schools are government institutions it's quite clear that teachers --- anyone, really --- can walk around armed to the teeth regardless of the safety hazard it presents to the staff and the students. It's in the Bill of Rights in that passage about militias and infringing. Nothing you can do about it.
Next on tap: allow teachers to teach whatever they want to the kids. What? Not ok? I wonder why that would be? Freedom of speech is in the Bill of Rights too. Right at the beginning. And it's really simple.