COPAA mama here, it's actually a nonprofit that has brought lawsuits before the Supreme Court. It stands for council of parents, attorneys, and advocates. To be accepted into the directory of professionals you're not allowed to be employed/receive money from a public school system due to conflict of interest. Not implying that anyone who isn't a member is anything less than wonderful, they're just too busy to join, but I do think it shows who's plugged into the local community. Members in nearby counties and states communicate with each other, so you'd get access to a deeper referral network if you need a lawyer or a placement in a different school system. They also host free parent trainings (which is how they got me!) but that's about it for benefits. I do want to note that Monica Martinez has completed advocacy trainings they've put on in addition to being a member, so she probably has the deepest connections to the community out of the other people I've mentioned. It's certainly not the end-all be-all, but every bit of information helps