You wanted armed teachers, you got one. You might note that he was a "good guy with a gun" right up till he barricaded himself and started shooting.
Diversion noted.
I don't know if he was a good guy with a gun. He's probably never been checked out before. Remember, the teachers union fought against having teachers drug tested like those of us in the private sector.
Drug testing teachers has nothing to do with this. According to the NRA and gun nuts across the country, If you haven't been convicted of a crime, you are a good guy with a gun who should be allowed to buy all the guns he wants.
Obviously he isn't a good guy with a gun. Good guys with a gun don't bring them to a no-gun zone school. Good guys with a gun only bring guns to where they are legal.
So all the gun nuts here that claim to conceal, and proudly admit they carry EVERYWHERE aren't good guys with guns? You should explain that to them.
You have evidence he had a license to conceal? I didn't see anything like that in the article. If he didn't pass any gun course, take a test, fingerprinted at the sheriff's office, then I don't know anything about this guy. For all I know, he did this several times at home. The school doesn't check these things.
However if the school did adopt a program to allow teachers to carry firearms, he went through all of the above, then yes, he would have been considered a good guy with a gun just like the rest of us with licenses.