Senator Kirsten Gillibrand urged the federal Justice and Treasury Departments on Sunday to swiftly implement newly approved methods of tracking mass shooters and gun traffickers.
In September, the International Organization for Standardization (ISO) approved merchant category codes (MCC) in order to help keep a close watch on those making large-scale purchases of firearms and ammunition. These four-digit numbers are the same merchant codes that are used in grocery stores, nail salons and other businesses — but up until recently gun retailers were able to operate without these codes, making it impossible to know when an individual made a bulk purchase of deadly weapons.
