FBI Director James Comey says police restraint, born from increased scrutiny in the wake of high-profile police killings and evidence of racial bias, may be contributing to an uptick in violent crimes in some cities. Andrew Harnik/AP hide caption

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Last October, a 15-year-old student and member of the Tulalip Tribes in Washington opened fire at his high school with a gun obtained from his father. The tribe had issued a restraining order against the father, but that information didn't show up in the federal criminal database — so he was able to buy the gun. Ted S. Warren/AP hide caption

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Michael Horowitz, the Justice Department's inspector general, testifies before a House committee in 2012 critical of the department's "Operation Fast and Furious." Thursday, he said a legal opinion from the department could block his office from getting documents crucial to his watchdog role. J. Scott Applewhite/AP hide caption

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