As I've said twice now, that is a damned nice case. Back to the jurisprudence. i tend to agree with both Foxer and Mlehtovaara that it is not cut and dried. It is a collection of shades of grey. Some of you pointed out that he said he was going on a killing spree and the gun was loaded. However, if you read the judges' statements, you'll find that the loaded gun charges were dropped, and that the statement made by the douchebag ('cuz that's what he was, and he DID deserve to be locked up) was disregarded. From my understanding, the judges ruled from the technical point which was "Was the firearm concealed?"
I also totally agree that there is a pretty good chance a person could get such charges thrown out. In most cases, if you were dealing with a reasonable LEO, you'd be congratulated on such a nice case. BUT, I know i certainly would not have the money to take such a case to trial and to several layers of appeal. I would, in all likelihood, have to accept a plea bargain. That was also my main motivation when I researched this in the first place, because he would not be able to afford thousands in fees either. If it were me, I would simply get a small decal or tag to place on the case, just as insurance to avoid potential problems.
Again, I am sorry if I appear to have been a PITA on this, I was simply trying to provide the OP with a starting point so he could do his own research, make an informed decision, and possibly avoid a lot of unnecessary hassles.