I feel reading PL 94-142 which is the law for children with disabilities as well as the history of that law would be a good idea.
It tells the rights and steps that are to be followed for children with special needs. It is a Federal Law.
Since I am from Minnesota and was a teacher at the time the law was instituted, I can inform that in the beginning, Minnesota had 10% of children in special needs education,
The Feds said, No no no! The Bell curve had to be followed with only 3% allowed in special education.
Eventually, the term Least Restrictive Environment came to be as parents sued that their kids were being warehoused in special ed.
That is why kids are moved out of more intense environments. Plus, that kind of education is expensive. It is an unfunded mandate.
In wealthy school districts, kids get away with more as parents can afford lawyers. Administrators would be in court the whole year everyday.
Orono in MN just had some kind of threat where the kid was removed in handcuffs, I doubt if there are any poor kids in Orono.
Which brings up the issue that it seems like most school shooters come from white affluent families.