On Wednesday, Florida Chief Financial Officer Jimmy Patronis issued a statement claiming that he would work with Florida lawmakers to penalize credit card companies like Visa and MasterCard should they apply a new sales code to distinguish firearm purchases at U.S. gun stores. The announcement follows claims in the media that Visa, MasterCard, and American Express will create a new merchant category code for gun sellers. According to gun control advocates, the new sales code provides banks and credit card firms with tools to identify irregular patterns of purchases, such as a potential mass shooter stockpiling weapons and ammunition and...