Do teachers’ unions really prohibit non-public agencies from serving as children’s aides in public schools?

Some special education administrators will initially mention this as being a reason why they cannot authorize non-public agency support for a child. It is true that some districts' aides are in labor unions. However, in the past 25 years, working with at least 40 different school districts, the union issue has never affected our ability to serve children in public schools. The issue generally disappears if you ask for specific details about the exact constraints that districts are working under.