Rent-a-cops, security that usually only have "guns" with rubber bullets, if that. They "patrol" schools, concerts, and sporting events, but if there's anything close to a fight, they're out of there like rats out of a sinking ship.
The phrase was coined in Nova Scotia, Canada by snowplow drivers and was originally used solely for pre-911 airport security.
"Did you see the Mickey Mouse patrol during the Code Blue today?"
"Yeah, I saw a few of them go out a window. Too bad it was on the second story."