Heh. Want to place any bets they built the whole thing audio included and just before launch brought in the lawyers who quickly said WTF? To which the product team said ORLY?
Grandcentral (which was bought by google and is now google voice) had a great feature that when you received a phone call you could record it at any time. That feature was dropped by google. The laws vary by state. The state I used to be in you needed two party consent. The state I am in now only one party has to consent (so you can record your own phone calls in a one party state).
I believe that the same applies to surveillance cameras which is why most of them don't have audio they only have video.
Oh ok, here:
"Recording audio without the persons permission is almost always illegal, that's why our covert cameras don't have microphones. "
