I agree with Drift rider that we can't allow teachers to be armed because we know not what they'll do, however, I feel I must challenge this of his analogy...

Drift, you claim that we should judge people on what they have done, and not what we feel they might do...Why then, if I have never shot anyone, should I as a student not be allowed to carry a gun to school?

Moral of the story, using your own arguement, we should allow students to carry guns along with the teachers, based on the fact that none of them have a history of shooting anyone...

Why am I forced to drive 70mph on interstate? I MIGHT wreck and kill someone (myself included) if I were allowed to drive faster than that, even if I have no record of wrecks. Why am I prohibited from building a pipe bomb? Because I MIGHT use it in a malicious manner, even though I've no prior history of this manner.

Our legal system is based around preventing the bad things that citizens MIGHT do.

Allowing teachers to carry guns to school is going to encourage students to also carry guns. If you were headed somewhere where you knew your "Enemy" would be, and you knew that they'd be armed, I bet you take a gun.

Allowing firearms on school campus's promotes tension and detracts from the learning environment.

We can't allow our teachers to become prison guards with textbooks.