“I’m VERY serious in my belief that the teachers need to be trained and carry all the time.”
At least the front desk people - those who are first to greet any and all visitors.
That’s what I did do! Front desk. Sign in, sign out...that sort of thing.
I would’ve let him on the campus as he was the son of a teacher, and I’d have KNOWN him. I’d probably have seen him on campus many times.