This is interesting, particularly in light of MI law:
Jackson found that since the Baton Rouge ordinance banned firearms even in the parking lots of establishments where alcohol is served, it would make ordinary citizens who stopped at locations as benign as grocery or drug stores with firearms locked in their vehicles subject to arrest. The law was so broad, maintained the court, that it could also be interpreted as “rendering the sale of firearms at establishments like Wal-Mart a criminal act.”
... the judge has determined the ordinance to be unconstitutional.