A prosecutor in Lapeer, Michigan says, "No harm, no foul," after a charter school took the National Rifle Association's (NRA) advice and hired a armed security guard who promptly left his handgun unattended in a student bathroom.

Chatfield School co-directors Matt Young and Bill Kraly announced last week that they had hired retired Lapeer County Sheriff’s Dept. firearms instructor Clark Arnold as a security guard in response to the December mass shooting at Sandy Hook Elementary School in Newtown, Connecticut.

"It's a tremendous asset to the safety of our students," Young told WNEM in a report that aired on Tuesday.

But by Wednesday, the school had admitted to The Flint Journal that the retired firearms instructor had made a "made a breach in security protocol" and left his unloaded handgun unattended in the school restroom "for a few moments."