Apparently NBC's David Gregory, in violation of the District of Columbia's laws displayed a high capacity magazine clip on his TV show. "The District’s code says that “No person in the District shall possess, sell, or transfer any large capacity ammunition feeding device” whether or not it is attached to a firearm." [Police: NBC asked to use high-capacity clip].
When the ordinance was drafted it is unlikely that Mr. Gregory's action would have been thought to be within the proscribed conduct. The D.C. police are investigating - but an arrest or prosecution could likely void the whole ordinance as unconstitutional as applied.