 Starting tomorrow, a new California law requires credit card networks to provide banks with special retail codes for gun stores. The goal is to spot suspicious purchases and help avert mass shootings. But Georgia, Iowa, Tennessee, and Wyoming are going in the opposite direction. They have new laws prohibiting the use of special gun shop codes. 17 states have passed some sort of limit on category codes for gun retailers, while California has been joined by Colorado and New York. Michael Toscano, CBS News.