I am a high school teacher at a continuation high school. If there were going to be a shooting or stabbing, I have pretty good odds of it occuring at my school.
High Velocity. I understand your wanting to protect your kids, but I completely disagree with your assessment of a citizen's ability to be a resonsible firearms user vs. a law enforcement officers. If you get nothing else out of this thread, please get this. There should be no difference in your mind about the abilities of a regular joe schmoe citizen and a police officer. They are no different than us. NONE! Might they receive more training than most citizens, sure. However, just in case you missed it, go watch this video. (this is the good version, fast download)
http://www.big-boys.com/articles/copshootsleg.html
Having just watched a "trained" DEA agent shoot himself in the leg with a handgun in front of students, can you honestly still believe cops are the only ones professional enough to be armed around your children? I hope not.
Now, on to carrying as a teacher. I personally wouldn't want to. I carry every where else, so I am not uncomfortable with carrying. I would be uncomfortable with students ever finding out I carry. The nice thing about CCW is no one knows I am carrying and so I don't feel like a target and I don't have to be as concerned with weapons retention. The dress I wear as a teacher isn't all that great for concealed carry. I just wouldn't want to. If a student ever did find out I was carrying, you know it would be all over school in no time. Plus not all students are mature enough to handle their teacher carrying. Sure in a perfect world they wouldn't fear a teacher who carries nor would they disrespect such a teacher, but this place ain't perfect. Just one kid finding out about you carrying and in my opinion the whole thing would be blown.
However, we have campus officers who carry openly and they aren't wrestled to the ground and their guns stolen. The problem is their job is different than mine. I don't want to be the "opposition" at school. That doesn't mean I don't enforce my classroom rules, but there is a definite difference between a security guard or police officer and a teacher. They serve two different roles. I don't think I could be as effective as a teacher if I had to carry and the kids even had an inkling that I was. I could be wrong if I tried it, but I doubt that would ever happen.
I would be more in favor of having a lock box in the classroom and having a gun in there. Let the kids know about it and make it a well known thing. That wouldn't be any different than the kids seeing the campus cop with a gun. You explain to the students that there is a lock box and it is to be used only in emergencies. Or don't tell them and keep it all hush hush. It don't matter. the difference to me is I don't have to worry about weapon retention and there can be no inference made by the students that the firearm can be used for anything other than life threatening emergencies.
If a student wants to walk into my class and shoot me, lets be realistic, there isn't a darn thing I could do about it whether I was armed or not. I can draw and shoot two in 1.5 seconds and closer to 2 or so concealed. However in a classroom setting, I would have to add at least 1 to 2 seconds to assess the situation and come to the conclusion that, "OH S**T THIS IS IT!", draw and shoot. Sorry, that isn't enough time and I would die if a motivated student came in and decided I was to die. I think it is important for gun owners to realize that a gun is not the cure all self defense tool. We need to realize that your time might be up and you might die even if you have a gun strapped to your hip.
However, if a kid comes in to the class next to mine and starts shooting or shoots the security guard outside, it would be nice to be able to get into a lock box within 10 seconds and be able to defend my classroom. In a situation like that, the rest of the students will respond and will listen to my instructions and so I wouldn't be worried about weapon retention, but just the threat at hand.
I have already prepared my classes. I explained to them that if a shooter does come on campus and we don't have time to jump out the back window and scale the fence or flee, they need to be prepared to kill someone for me. I tell them that if I take a bullet jumping on the guy who came in the door with a gun, they better kill him. I would do the same thing for them. It gets a little somber in the room because they realize I am not joking and I tell them to gouge out eyeballs, kick, bite, do whatever it takes.
I just think the dynamic in the classroom would change if the students ever found out I was carrying. I also don't want to have the added responsiblity of remaining concealed and weapons retention in the classroom. I have a hard enough time dealing with these immature and unmotivated youths as it is and the addition of a firearm into a classroom of immature high schoolers would create more problems. Give me a good lock box only to be used in case of a school shooting or stabbing and I would be all for it.