I have carried concealed for most of my life too, as well (as all my SA friends on the job) so I have some experience in this field too.
Carrying concealed with light clothing is not all that easy, unless you carry a very small pistol (say 32cal or below) which gives you very little stopping power. (hammers tend to ruin shirts unless you wrap them with rubber bands, etc) To regularly carry.... say a 9mm or above means toting a fairly large, heavy hunk of equipment around that becomes pretty obvious when you only have light summer clothes on.
Of course it can be done & LEO's do it all the time, but to expect a school teacher to force herself/himself to do this on the extremely off-chance that he/she will ever need it, i asking allot.
Of course LEO's are not supermen, but they have chosen a dangerous/confrontational life style & expect to have to apply deadly force some time in the careers as possibility. School personnel have devoted their lives to teaching & that usually attracts a different kind of person.
We are talking generalities here & of course there will be exceptions to every generality.
Now I'll give you a " for-instance".......:lol:
When I was in DEA training, we trainees always would arrest the bad guys (instructors) & pat them down, etc b4 cuffinging them. On one raid execution training scenario, an instructor (bad guy) had hidden a small caliber 32 auto in his underwear, just below his testicles. (the idea was that no trainee would reach down there to check for fear of being called a fag!:lol
The ploy worked perfectly & the agent trainee who did the search (an ex cop, btw) missed the hidden weapon & cuffed him, hands behind his back.
A few seconds later, the bad guy instructor reached down behind him, pulled out the weapon &, firing with from behind his back, "Killed" 3 agents...... b4 we killed him. (with blanks)
The moral of the story, as we were all made keenly aware is to do a thorough search b4 handcuffing & don't worry about what you may be called!
Listen, I understand what you are saying & you do have experience training civilians that I don't have......BUT...The fact remains that I don't think it's a good idea to try to train school personnel in the use of deadly force with children all around.
Kids have ways of knowing things & I think any armed teacher would be pretty easy to deiscover/target.
Here's an Idea I like better:
Train a group of LEO's to perform the function of armed school guards (posing as custodians, kitchen workers, whatever) & don't have their real identities know to anyone in any school, except maybe the principal. These professionals could be moved around (between schools) on a regular basis & still receive constant training to keep up their firearms skills. They would undoubtedly be more effective than typical school personnel as they had already chosen LE as the careers & this "School Guard" could be just a temporary assignment to keep alert level high.
I haven't really thought this idea through yet but I like it allot better than trying to arm & train civilians.