I think the highest the issue has gotten - in federal court - is: Simon Glik vs.The City of Boston and IIRC, the first circuit ruled in the favor of Glik who was apparently charged with illegal wiretapping.
I am of the opinion that IF there are no collateral violations of law then it is a First Amendment Right... One cannot reasonably expect to be within feet of a police action and be free to film or to record the dialog between an officer and suspect when either may have an expectation of privacy etc...
I don't get this? I didn't know I had a right of privacy when out on public streets. I didn't know that police could beat people with clubs and say say their criminal action shouldn't be filmed. Maybe I don't know what a collateral violstion is.