US government doesn't allow cameras around their facilities so if you are caught your spy pervert glasses will be confiscated.
As a photographer, I know this. You cannot point a camera at many Government installations without security approaching you and checking to see if you took pictures and then making you delete the photos. You really think they are going to let Google glass wearers walk around recording them all day long. They will especially be looking out for GG wearers.
"Welcome to a world through Glass. It's surprisingly simple. Say “take a picture” to take a picture. Record what you see. Hands-free. Even share what you see."
Complete invasion of privacy which Google the communist organization loves to do. Be warned, Google is the beast.