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@dnkboston @Strandjunker
The wikipedia article has information on one case, with links: https://en.wikipedia.org/wiki/Sex_verification_in_sports

There's also an article in Scientific American that refers to it: https://www.scientificamerican.com/podcast/episode/sex-testing-in-the-olympics-and-other-elite-sports-is-based-on-flawed/

"It will not necessarily catch all men who try to enter a women’s competition because some men can have XX chromosomes. All you’re going to do is catch women who have no idea there’s anything different about them..."