Do you know anyone with Down's syndrome?

I'd suggest your parents fight for her to go to a regular public school --- there's no reason she cannot attend and then have a behavior plan for her school day - there are so many options. One that does not include the adults losing control and using aggressive tactics. That's abusive and I would almost guess illegal. Especially on someone with a disability!!! Very sad to hear this

I'm so sorry to hear about your sister. That special school is ridiculous, it is supposed to help those kids with mental disabilities & not to treat them worse like an animal. They shouldn't promote violence on attacking students no matter how "threatening" they are. You better off transferring her to a much better special school where she will be treated with respect.

My parents have been looking into finding a new school for her, but the problem is, they can't find any. The one she currently goes to is 40 minutes away, so I think that says a lot about the availability of her schooling options... I wish there was an alternative for her though.

I remember when I was still a student way back in the 80's (yeah I'm too old now), the regular school that I attended has a special school for those students with disbilities. We interact with them 2-3 times a week. Perhaps you inquire some regular schools if they have something like that.

EDIT: added the quote

My uncle had Down's. They were a farm family and he always had work to do. He was probably about the level of a first grader, but back then (he was born in the 20's) they didn't try to teach them anything, so it's hard to say by today's standards. I would think he would have been able to read. His vision was bad--thick glasses and he was a bit clumsy, and plump--like most Down's. But oh, so, loved. Probably half the town was at his funeral. Probably more.

In today's world, things in many ways are much harder--they DO remain very much children as adults, and must have some level of supervision. And they need time to play and learn throughout their lives. A Down's boy I know now was "graduated" out of the public school when he aged out at 18 and his parents had to find a place for him while they worked. They found a work center where he has a job that he loves, but it's an hour away. So his father is able to work in the same area and they commute together. Hang in there. Love her. Do you pray? God loves Downs folks you know, He looks at the heart. You can find a way. And love your parents. I am always SO encouraged when my children notice and reach out to each other, and especially when I'm having a struggle and they notice. I would imagine your parents are at wit's end, as you seem to be. You can find a way to make things work, but it may not be easy at all. It will be worth it when you get the situation working like it needs to be, and you can relax knowing she's safe when you all have to be gone and enjoy her when you're around.

I worked in a special school for teenagers for a short while, where they used restraining techniques where necessary and I was even trained in a couple of them. I honestly don't know how on earth she ended up being thrown face down on the ground by a security guard, what I was trained in was nothing like that at all, it was all very gentle and involved special techniques to restrain someone and keep them in one place, none of it was attacking the person or throwing them around.

I'm not that experienced as I was a substitute teacher there as opposed to permanent, but honestly what you say sounds totally wrong and your family should investigate.

If you're in the UK, the law requires them to fill out an incident form for any injury to staff or students, and if you're not in the UK I'd be surprised if it was any different where you live.