I posted the video below last week.
More information has come out about the fired police officer and it's disturbing. Christopher Lloyd, the former Dolton cop seen attacking a student in the video, is currently in jail in Indiana charged with the rape of a woman at knife point last month. In February 2008, eight months before the Dolton PD hired Lloyd, the officer was suspended from his job as a Robbins, Illinois police officer after he shot his ex-wife's husband 24 times--in self-defense. And Dolton PD assigned this guy to a school for children with special needs.
Radley Balko has the story and more links.