521 Bullet Casings Stock Photos, High-Res Pictures, and Images - Getty Images

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Live rounds that will be used in the newly acquired bullet trap where on average 30 guns a week will be fired to get a fired shell casing to scan and catalog the firearm shell casings to enter in a database in milwaukee at the Police Head Quarters August 18, 2016. The database, called the National Integrated Ballistics Information Network, contains high-resolution images of almost 3 million casings police have collected from crime scenes and test-fired from guns nationwide since 1999. The software reads unique markings that weapons leave on casings and then flags potential matches, signaling when the same gun may have been used in more than one shooting. Get premium, high resolution news photos at getty