Access Fandom

I am on a committee of a conventions and we are talking policy. We are talking about medical documentation requirements for accommodations, and I am having a hard time finding the right words to tell them why this is a /terrible/ idea, and as a newb of sorts, I'd love to have some authority to stand on. Is there a good blog post or website out there already outlining the reasons why that is a bad requirement, and why?

Thank you.

(I promise, my next post will have content)