Is a School Resource Officer armed? Does he have quick access to a rifle, shotgun, smoke grenades, etc? (seriously, I don't know)
In my local school system the SRO is a Deputy Sheriff and carries his duty sidearm (Glock 22). I'm not sure how it is now but when I was in high school (10+ years ago) one SRO was assigned to six schools encompassing all students in the county. I seem to remember someone mentioning they'd assigned more in recent years but that may or may not be true or it may have been brought up during a commissioner's budget meeting and that's what I'm remembering.