As with anything else common sense plays a large part in the difficulty one could encounter carrying a concealed pistol in a no carry location. It can also have a great deal of positive impact on the outcome of ones contact with an officer of the law. I think it was Forest Gump's momma who said "Stupid is as stupid does". I don't mean that personally it's just an observation from 30 years of being a cop. Even being a retired deputy sheriff I can not legally carry everywhere. Federal buildings including post offices and casinos are a couple.
Have a great and safe day....
Bob G