“In FL, you can laugh at the “NO GUNS” signs and walk on past. They aren’t enforceable at all.”
How so?
Jon Gutmacher’s book discusses it on pages 131 and 132. Armed trespass is a felony, but only if you were warned that you were trespassing and refused to leave. Since a mall or any business with an open door is inviting the public to come in, ideally to buy something, they have to tell you to get out before you can be a trespasser. There is a charge for the posession of the concealed weapon in spite of the sign, but several deputies in the area assure me that it is a civil offense - money but no criminal record.
That’s unless they actually tell you to leave and you refuse to do so within a reasonable time. Then you’re screwed.