Unless I missed it, no one's mentioned the difference between using CVRs in criminal and civil proceedings.
It's one thing to put the recording in the hands of a civil servant who's paid to determine whether there's reason to believe a crime has been committed, and to do nothing if there isn't.
It's something else to put it in the hands of a plaintiffs' attorney, who's effectively paid to win cases and doesn't care who gets hurt in the process.