Doug is correct but there are other factors at work here. Whenever I am in Whitney Portal, I check notices of parked vehicles. They are of the "You've been a bad boy, don't do it again" variety rather than the "Moron, you left food in your car, do not pass Go, go directly to court and pay the stinking fine". If people knew there was a cost associated with this type of behavior, they would not do it anywhere near as much as they do.
