For those interested, there are two cases that have been heard in the 3DCA. The first case is Mackey (Anthony) vs. State of Florida. In a nutshell, the defendant (a convicted felon and therefore a prohibited person when it comes to firearms, anyway) was arrested in 2010 after a patrol officer who spotted him standing alongside a fence observed the butt (referred to as the "handle" in the affidavit) of a handgun exposed and protruding from the pocket of the arrestee. The appeal was based on the idea that the officer would not have had probable cause to believe that a crime was taking place, since the mere possession of a concealed firearm in Florida is not illegal; the lack of a license to possess such would have to be suspected to warrant the stop.
The 3DCA upheld the conviction (which was actually a guilty plea) based partially on two things: the weapon was not fully concealed, which (at that time) was a violation in itself, and that the "affirmative defense" of the lack of suspicion of no-carry-license would, in effect, even strip away the authority of an officer to stop a man wearing a mask, hood, gloves, and climbing over broken glass into a clearly-broken window of a dark house at night simply because he would "have no reason to believe the subject had no right to be in the house."
In the Regalado case to which (another forum member) refers, the defendant was stopped by an officer after a citizen pointed him out as one he had just seen "displaying" a gun in his waistband. The citizen then leaves the encounter without identifying himself. The officer never saw the firearm until the defendant/arrestee was stopped and searched. The "affirmative defense" of the idea that the officer had no reason to suspect Regalado had no carry license, and would not have known he even had a firearm had it not been for the anonymous complaint, is what helped the defense in that case. I'm not clear on the outcome of that appeal, or if it has even been resolved yet.