A zero-tolerance policy in schools is a strict enforcement of regulations and bans against undesirable behaviors or possession of items. Public criticism against such policies have arisen due to their enforcement and the resulting (sometimes devastating) consequences when the behavior or possession was done in ignorance, by accident, or under extenuating circumstances. For example, a ban against guns resulting in a Rhode Island boy with a gun charm on a key chain being suspended. In schools, common zero-tolerance policies concern possession or use of illicit drugs or weapons. Students, and sometimes staff, parents, and other visitors, who possess a banned item for any reason are always (if the policy is followed) to be punished.