Comment by leptons

No, you can't film people in public restrooms, but that is an exception. There are limits to freedom of speech. You also can't yell "fire" in a crowded theater if there is no fire.

But yes, recording in public is generally very much allowed, and for good reason. I'm happy that we can film our govenment and dissemenate those recordings when they do something wrong. And that is the same first amendment right that gives government the ability to record too. And there are very few restrictions on recording, so yes, there is no REASONABLE expectation of privacy in public - the situations you outlined are all unreasonable. There are limits to free speech, but that doesn't mean recording in public isn't generally allowed.