Hi Big_John,
Thanks for the comments. I completely agree regarding that if you are carrying concealed properly, no one should ever know you're carrying but a couple of cautions. First, In PA, if someone has a sign on the door and you bring a weapon in anyway, that is technically a misdemeanor trespass because it is viewed the same as if they told you to stay out and you entered anyway. The police can site you for this in PA. The legal term is Unlawful Trespass, different to Criminal Trespass but a crime all the same. Second, the attempt to restrict carry in a casino was struck down April 16, 2015 in PA.
PA is actually an open carry state meaning you don't have to have a permit to carry a firearm unless you carry it concealed. Concealed carry requires a permit. Some of the exceptions to this are State facilities, Federal facilities and schools (Fed Law), mental health facilities, child care facilities. In these areas you are not allowed to open or concealed carry. Class 1 cities of which Philadelphia is the only one currently, you are not allowed to open carry.
Every state is different. In PA you can open or concealed carry in a bar. In FL you can not. If a restaurant has a bar, you can carry in the restaurant but not in the bar area.
My point is, if you're going to carry, make sure what is legal in your state. It's you're responsibility. Another critical point is that every law is subject to interpretation first by the investigating officer and ultimately by the courts. As I've eluded to in other posts, carrying is not for everyone and you must be prepared both legally and emotionally for the ramifications of doing so.