Wrong.
The whole point of concealed carry is that nobody knows you’re carrying.
That means that, to the bad guys, every teacher is potentially armed.
Just the idea that any teacher could shoot you will be a big deterrent.
That’s why violent crime decreases when concealed carry is implemented in a state.
Just one of many reasons this cannot and should not be a plan depending onwhether or not someone wishes to participate.
This fools' fantasy is wholly unrealistic.
The most practical, viable plan is simply to cease making school properties gun-free target-rich locations, and granting the 2nd Amendment its proper place in a supposedly free society.