If you or someone you know has been "kicked out of school" as stated previously for refusing to take meds, they should be calling up every media outlet in the country and they would have 5000 lawyers on their doorstep begging to take the case faster than you could snap your fingers.
Maybe, but how many parents have heard "your son has ADHD and if he remains unmedicated, he will be at risk for expulsion". People who DON'T know the law. People who believe there's no way they could afford a lawyer. People who don't understand the legal jargon, have difficulty reading the medical language surrounding their children's issues, etc.
A lot of parents, is the answer. And many of them medicate their child simply because they don't want to see them get expelled, whether or not it's legal.
That said, if the parents are willing to fight, there's nothing the school can do, as Cali illustrated earlier with her example. In middle and high school, there was a VERY problematic girl. She could keep up with the curriculum easily, I believe she was Autistic...however, she would often have incredibly disruptive outbursts of screaming, running around the classroom, crying, etc...I'm talking on a weekly or more basis.
Sometimes, these episodes got violent. She often swung or lunged at other students and needed to be restrained by her one-on-one (which changed every few weeks, I think most quit for being unable to handle her) and on multiple occasions, security was called to restrain and escort her out. This is extremely disturbing for a classroom of 11 or 12 year olds.
One time, she had a violent outburst in the locker room, in 7th grade. I was dressed, but every female student in my (mixed) gym class, was rushed OUT of the locker room and into the gym, many of them not dressed, and...(beats me why 7th grades would need this kind of underwear) in thongs, bras, etc. I think they locked all the boys in the boy's locker room, but it was still in front of a bunch of male gym teachers...until the male security guards could come in, restrain her, and remove her from the locker room.
How the hell that didn't turn into a lawsuit, I don't know. And she still remained in school, all the way through high school.