In this March 24, 2018, file photo, thousands of people gather on the grounds of the Texas State Capitol during a "March for Our Lives" rally in Austin, Texas. The vast majority of mass shooters have acquired their firearms legally with nothing in their background that would have prohibited them from possessing a gun. But there have been examples of lapses in the background check system that allowed guns to end up in the wrong hands. Very few states also have a mechanism to seize firearms from someone who is not legally allowed to possess one.(Nick Wagner/Austin American-Statesman via AP, File)
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