Increased credit card tracking of gun purchases is now taking place.

For starters, it was last month that Elizabeth Warren sent out a tweet saying that "Credit card companies like @Visa, @Mastercard, and @AmericanExpress can and should do more to help stop mass shootings. @RepDean and I are urging these companies to step up and help identify suspicious purchases to prevent gun violence."

Within three days, credit card giant Visa stated that they were changing the way that they recorded firearm sales within their business. Instead of being categorized under the "general merchandise" category, firearm sales will now apparently be listed under their own designation, meaning that there is another way that these purchases can be isolated and tracked by credit card companies.

With this new designation, banks would then have the ability to deny the use of credit cards to purchase anything firearm related. If the bank is notified that there is a pending purchase for something under the new firearm category, they can easily deny the transaction, should they desire to do so.