A friend of mine is a special ed teacher who works primarily with children who are low functioning autistic. This past year, she worked with 5 boys, 2 of which who were pretty violent. She came home daily with scratches, bite marks, and all sorts of bruises. It was bad enough that she and her co-teachers had to request specialized equipment (gloves, etc) to protect themselves when working with these boys.
Has your child ever been violent? Has s/he ever physically hurt someone else?