Subject: Re: Can't They Just Leave Women Alone?
But that requires a court. Which means a complaint is filed somewhere. Lawyers ($$$$) get involved. And if the person is legit-trans, they're OK. But they had to expend significant time and money to establish that. So that isn't fair to the legit-trans person.

It's insanely unlikely that the trans woman is ending up in court. If you're a cis man with no history of any indication of transitioning, putting on a dress so you can very traceably and provably head into a ladies locker room is a phenomenally stupid way of getting your jollies. You're certain to go to jail if you get caught. And you'll be found out with even the most casual investigation - even if someone just asks to see your driver's license as you sign up for whatever gym or sports club you're enrolling in, it's going to have all the cis male indicia that can get you flagged in their system. A legit trans woman will have little problem documenting that they have, in fact, been transitioning.