So it appears to be only Massachusetts that bans "secret" recordings, meaning that only notice is required, not affirmative "consent". I also know from personal experience in Mass that applies only to audio, not to video. Long story, but at one point was involved in a situation where prosecutor was seeking to charge me with violating this statute, but as I had taped over the microphone and was therefore capturing only video, but not audio, they couldn't make a case.