> The only value they offer is violating people's privacy. I don't think reading a value being freely broadcast by a person in your building is an invasion of privacy, how is this any different from having security cameras with audio or anything else. Saying you have privacy to something you are broadcasting in public, even more specifically in this case a privately owned building is a little daft. Do you think it's an invasion of privacy if someone writes down your name and address if you were yelling it in the middle of a Starbucks?