Yeah, states differ on that; some have it right, others are ridiculous.
I remember while reading Walsh's last book on Armstrong, that Greg LeMond's input was questioned because some of it was recorded from a phone conversation without both parties' consent, as the law in MN requires. Sure, there's a reasonable expectation of privacy when on the phone. But I'll be damned if I can figure out how anyone can claim a violation of privacy when they're out in PUBLIC! About the only privacy violation I can think of while out in public happened in a small town some miles south of where I live; a store clerk had mounted both a mirror and a small camera on his feet to "upshot" underage girls wearing dresses. THAT'S a violation for SURE, but...out on the street, in your car or walking around? It's like trying to copyright what you say to someone on the bus.....