Canceled.

The problem with relying on good people with guns to shoot bad people with guns is that no one is all good or all bad. We see on a daily basis good people doing bad things, inept things, dangerous and hurtful things with guns. Life is not so one-dimensional, so over-simplified as the shallow, failed thinking of the NRA.
From the Raw Story:

District suspends police-in-schools program after officer discharges gun

A school district in New York has put a program to put armed officers in schools on hold after a policeman’s handgun went off at Highland High School.
At a Wednesday meeting with parents, Highland Central School District and police officials explained that Officer Sean McCutcheon had been suspended after his Glock .45-caliber pistol “accidentally discharged” in a school hallway at around 1:38 p.m. on Tuesday.
Lloyd Police Department Lt. James Janso said that a suspension was standard procedure while the incident was under investigation. Officials offered no further explanation as to why the gun discharged.
Some parents at the school board meeting questioned whether having armed guards in schools was worth the risk.
“What if a kid had been killed?” 43-year-old parent Mark Wallen asked. “We got lucky this time and that’s purely what it is.”