We had a boy in my school one year that ripped apart a classroom. I mean, he torn bulletin boards down, overturned tables, desks and chairs, if it wasn't nailed down, he disturbed it. They finally got him under control and had him sitting in the office, where he proceeded to rip the bulletin board in there down as well.
When my vp called his mother, she denied that he could ever do something like that. VP took pictures of the classroom and the office. When the mother finally got to the school, they brought her to the classroom and she actually laughed and asked her son, "You did all that?"
I had him the next year and while he never did that, he was in trouble quite often. He threw things at other kids; dry erase boards, chairs, etc. Truly a disturbance to other kids and to the whole classroom environment. We tried very hard to get him classified so that they could move him, but his mother refused. It is very rare for districts to spend the money to take the parents to court and from what I've heard from people in special services in my district, even when they do take the parents to court, the judges usually side with the parents.
But yes, our raises should depend on these kids passing a standardized test.