That's tough. I'm not sure they should wear body armor on a daily basis. I would say have it within reach. I know this might backfire and every second counts in a situation like this, but I'm afraid it could give a poor image of them. Remember, there's probably a 1/1M that there's going to be a mass shooting at a school. It may be little less or a little more, but in the scheme of things, they are very rare. I think their daily duties would primarily be other areas regarding school safety.