I don't believe there are legal impediments. I could talk simply about what's happening in Ontario. We have, right now, close to a third of the students in classrooms, who have what we call individual education plans—a third of the students. However, nothing has changed in the classroom, so you still have one teacher with 30 students.
The teachers have growing obligations there to cater to the very individual needs of every student, but the training hasn't changed. The teachers don't feel they have the training to do that, which means a lot of children would then just fall through the cracks, even though they do have the plan. On paper it looks good, but in practice, it doesn't.
I believe the situation must be very similar in countries that do have legislation, because legislation, we have it, but then the practice is different, and the practice includes lack of training.