States where Guns may be carried by School employees (under certain specified conditions): 18 states so far

-Alabama (which bans possessing a weapon on school grounds only if the carrier has "intent to do bodily harm")
-California (with approval of the superintendent)
-Connecticut (with approval of "school officials")
-Hawaii (no specific law)
-Idaho (with school trustees' approval)
-Iowa (with "authorization")
-Kentucky (with school board approval)
-Massachusetts (with approval of the school board or principal)
-Mississippi (with school board approval)
-Montana (with school trustees' permission)
-New Hampshire (ban applies only to pupils, not adults)
-New Jersey (with approval from the school's "governing officer")
-New York (with the school's approval)
-Oregon (with school board approval)
-Rhode Island (with a state concealed weapons permit)
-Texas (with the school's permission)
-Utah (with approval of the "responsible school administrator")
-Wyoming (as long as it's not concealed)
end partial quote from:

Here's a List of
School Districts
That Already Allow
Teachers to Be Armed - Katie Pavlich

Townhall