I'm not an expert on this. I just know from a humane point of view and from a mental health point of that it makes sense. I can just speak to the experiences I've encountered in other countries.
My understanding is that many of the behaviour issues that we encounter are from mental health issues. As I talked about in my opening statement, the majority of people in prison do have some mental health difficulties.
First of all, sending them to segregation isn't the answer to actually help them with their problems. In one centre that I visited, instead of sending people to segregation they would actually have a special unit where there were more counsellors, more people to work with them, more psychiatric nurses, more community players, and they actually worked with them fairly intensely or closely so that actually they weren't left alone. It takes more resources in some ways, or more community involvement or more health involvement, but the premise is that actually people will do better by being with other people rather than being isolated and alone. So if you put people in isolation, as Amber has talked about and also as the studies say, and you deprive them of contact with other people, and you deprive them of many of the things that we would normally have as humans, they actually get worse. They get more angry, more aggressive, more violent, and then their mental health actually starts to take a quite serious turn for the worse.