Children being mislabeled with ADHD

I volunteer in my child’s school and I have had conversations with many parents at various schools about the children being mislabeled, by untrained behavioral professionals, with ADHD. These parents have had their children tested NOT to have ADHD. The parents’ have a concern that the teachers will treat their child in the cookie cutter approach, which in turn will negatively affect their education within the school.

As mental health professionals, what are you recommendations?