They have video surveillance signs. Audio is a different category in a lot of states. In California, it's illegal to record audio without consent of all of the parties, and I believe you can get a civil remedy of $5000 for this.
I would be willing to bet the TV's demo mode used by most box box retailers disables that by default, specifically to avoid such an issue.
I would be willing to bet the TV's demo mode used by most box box retailers disables that by default, specifically to avoid such an issue.