“Oppositional Defiance Disorder” is a diagnosis that can get a student an IEP.
So a disruptive, violent child can show up to school every day - throw chairs, bring drugs to school - then get mom or dad to take them to the doc to diagnose them with ODD. It’s a manifestation of their disability.
“Inclusion” also means that these children need to be placed in the same classroom as all the other children. So 29 children are subject to the violence of 1.
It is not a particular student.
The amount of disruptions should be considered but realistically the line is drugs or weapons. This is explicitly the line that I have heard from multiple administrators over multiple districts.