Wal-Mart, the nation's largest seller of firearms, is tightening up its rules for selling those guns.
For instance, the company's creating a system to track and alert when a gun bought at Wal-Mart is used in a crime, and if the person who bought that gun tries to buy another, the sales clerk will know.
Wal-mart will also hold on to images of gun sales.
No word on when the changes start.
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