I fully support teachers being able to carry concealed in the classroom and at all school-sponsored activies. I think some type of training beyond a CCW class would be in order, though. With that many people guaranteed to be in adjoining areas, some extra tactical and marksmanship training would be a good idea. Something along the lines of each state's Highway Patrol providing the training at a reasonable cost to the teacher?
If the difference between a law allowing it being passed or not meant skipping the training to allow it, I guess I'd say skip the training. Armed teachers with no training beyond passing a CCW class would be better than continuing the designated victim zones, at least.