Laws taking effect Monday in California and Tennessee highlight the nation's stark divide over guns: While the former is looking to help banks track potentially suspicious gun purchases in hopes of ...

California this month became the first state to require credit card companies to create a unique four-digit code for stores selling firearms. And on the same day the law took effect in California, ...

A new law in Colorado will track firearm and ammunition purchases across payment networks, a move gun reform advocates say will help track suspicious purchases that could precede a mass shooting.