The Long Island Advocacy Center is a number you should have in your back pocket, especially if you have a child transitioning from CPSE to CSE. Basically it is a service dedicated to protecting the legal rights of students and individuals with disabilities. Their contact info as follows:
For Nassau:
516-248-2222 X10
For Suffolk
631-234-0467 X10
Or Email at office@longislandadvocacycenter.org
They also have parent training–see blog page for details