IIRC, It's illegal for them to ask to see such. They can inspect/scan/search, and in certain specific cases (like if you have residual radiation from medical testing) they can prohibit you from boarding without producing documentation for that, but they cannot ask to see documentation/proof of any medical condition/disability.

You won't get an argument from me on that point. Scholarly articles are often written that way. That's one reason I provided criteria for searches for more 'lay-friendly' articles.

[Addition:] The article is also invaluable for the compiled list of cited references/sources, which may or may not be written in academese.

Doc