imported post
Actually, and unfortunately, you "dump" several civil liberties when you enter a mall or other "quasa public" (sic) place, also known as a place of public accomodation. While the Civil Rights Act says you (the property owner/agent) can't prevent access based on protected class (race, gender, religion, etc.), other restrictions are allowed.
The owner/agent can ban smoking, weapons, non-service animals, outside food (my pet peeve of theatres which I never break.. honest.. really), etc. They can search your bags, prevent you from handing out literature or carrying picket or protest signs, and they can even require shoes/shirts, etc. Hell, there are some restaurants that require you to wear a tie. They may have awesome food, but I'll never know. Now, of course you have the right to tell them "No" on any of these points, at which point they have the legal right to ask you to leave.
Some headway has been made against this. There are some recent lower court rulings that posit that the shopping mall is the successor to the town square, and as such, certain things like protests can be allowed within certain limitations. It's not a huge step like Heller, but it is a foot in the door.
-RedKnightt--
Zombie Squad has it right: "We hold fast to the belief that if you are prepared for a scenario where the walking corpses of your family and neighbors are trying to eat you alive, you will be prepared for almost anything."