I am sure some number of teachers already have the requisite training to be able to safely carry a gun in a school, and there are probably more teachers who are generally interested in this training but have not gotten around to obtaining said skills.
Also, every teacher doesn't need to have a gun, teachers only need to have the option to carry a gun in the school. The goal is not necessarily for the teacher to win a gunfight with an attempted mass shooter, the goal is to deter the mass shooter from going to the school in the first place.
I'm not sure about that. Assuming that the option was viable, formal military and police training would still probably require a few more pieces to be legal. In many jurisdictions, police officers are required to have liability insurance policies to cover them from being sued into oblivion when they make a mistake that their department wont cover. I think it would probably be a hard sell to get a policy without extensive ongoing training. I can't imagine teachers wouldn't be required to have one if they were allowed to carry guns.
Again, you are automatically assuming the state will have to pay for it. Teachers are not hobos, the ones who want to do this training certainly would have it be within their means. This is not a requirement, so trying to pretend like the state should be on the hook for everything automatically makes no sense. How about we start with allowing those that choose to, to do so? Just like any other gun owner, you are liable for every action you take with a firearm, regardless of how much or little training you have had.
You can't legally have an employee undergo unpaid work related training, so the school board would need to cover that or be at risk of lawsuits. I don't know for certain that the state would have to pay for everything, but based on employment laws, I can say with relative certainty that teachers wouldn't be allowed to provide for themselves.
You can't just put a responsible gun owner in charge of protecting lives, they need to be thoroughly trained so they don't put those lives they are responsible for at greater risk. Google says police academy training costs around $5k and takes 840 hours, followed by field training with a senior officer, and certification exams before officers are allowed to uphold public safety. Again, realistically assuming that the idea is plausible, teachers would need to go through similar if not greater levels of training as police officers as dealing with minors is not a simple situation. I'm sure there are specialization certifications on how to deal with violence around minors. Lets also not forget the routine psychological analysis, not sure what that costs, but I'm sure its cheap. There is a reason that someone you are trusting your life to is required to jump through so many hoops, otherwise they pose a risk to your safety. Even if you think the regulations are stupid, thats not the point of what we are discussing. I could be pro teachers with guns, but that wouldn't change anything I've said so far so its just my interpretation of the legal impossibilities that stand in the way.
I'm not accusing anyone of bringing it up, but I just wanted to mention it in case the conversation would have otherwise gone in this direction. Vigilantism is the worst possible solution. I would bet my life that under absolutely no circumstances would teachers simply be allowed to bring guns to school at their own discretion. It is such a huge legal liability that we are better off talking about nearly anything else.