There is already a massive problem where fairly normal active boys get stuck in special education because boys are more likely to be disruptive than girls. If you look at special education numbers they tend to be at least 10:1 male:female, if not higher. This is already where problem kids go. Though most special education teachers realize only a handful of these kids actually have issues learning.
The problem is taking care of special education kids costs at least 5 times what normal kids do. Which makes this an expensive option. The school I use to work for as their network admin eventually decided to keep special ed kids in the classrooms for the majority of the day, because they had so many that they would need an extra 'special ed' classroom at each grade level to handle them. The local school district liked to use that school as a dumping ground for every kid who had already been kicked out of other schools, which doesn't quite mesh with the schools goal of being a enhanced education better than what the local school district was offering.
The problem became the kids even that school could not handle. It was nearly impossible to kick out the worst offenders because they had already been kicked out everywhere else. They had all been stuck in special education before we had even seen them as well. Eventually the staff psychologist would end up watching 5-10 kids every day, because they were simply to disruptive. Not a task she enjoyed.