Like my son, I think many fall through the cracks. These kids may not be able to read but many are very smart and are good at hiding their disability. It’s much better to get labeled as a trouble maker than have people know that you don’t understand what you are reading.
That's very true, and I don't think we do enough diagnosis and remediation, particularly in the early grades.
On the other hand, no one knows your child like you do -- and if all the teacher sees is the "troublemaker" side, sometimes it's hard to know there is something else there, particularly if the teacher isn't very experienced and/or has a large class with several "troublemakers."
Also, sometimes the paperwork requirements at the school level are such that the child has to fail drastically before schools can even begin testing for dyslexia, etc. Unless the parent forces the issue or has testing done privately, it takes a long time for the school systems I'm familiar with to act.