John Lu (left), Reynold Liang (center) and David Wu (right) during a news conference in Queens, N.Y., after being the victims of a hate crime in 2006. New York City council member David Weprin (second left) and John C. Liu look on. Adam Rountree/AP hide caption

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Adam Rountree/AP

LaGrange Police Chief Louis Dekmar, at the Thursday remembrance for Austin Callaway. LGTV LaGrange Television/Screenshot by NPR hide caption

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LGTV LaGrange Television/Screenshot by NPR

The police force for protection of Italy's cultural heritage is headquartered in Rome's Piazza Sant'Ignazio. Sylvia Poggioli/NPR hide caption

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Sylvia Poggioli/NPR

For Italy's Art Police, An Ongoing Fight Against Pillage Of Priceless Works

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An officer salutes and family members watch before pallbearers take the casket carrying the body of officer Jose Gilbert Vega from the hall after funeral services for two police officers on October 18, 2016 in Palm Springs, Calif. The officers were fatally shot and a third wounded by a single gunman during a neighborhood disturbance earlier in October. David McNew/Getty Images hide caption

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Police watch activists gather in front of The Metropolitan Museum of Art in New York on July 7, as they march up Fifth Avenue in response to two recent fatal shootings of black men by police. Later, after a peaceful march in Dallas, a sniper targeting police killed five officers and wounded several others before he was killed. Yana Paskova/Getty Images hide caption

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Yana Paskova/Getty Images

How The Perceived 'War On Cops' Plays Into Politics And Policing

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Mourners raise their fists during a night rally in honor of Alton Sterling outside the Triple S Food Mart in Baton Rouge, La., on July 11. Sterling was one of several men killed in police shootings this year. Gerald Herbert/AP hide caption

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Gerald Herbert/AP

In 2016, Violence Pervaded Policing On Both Ends Of The Gun

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Anthony Salemi, of Everett, Mass., holds a photo of his brother Joe, who died from an overdose of fentanyl-laced heroin earlier this year. Jesse Costa/WBUR hide caption

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Jesse Costa/WBUR

Deaths Involving Fentanyl Rise As Curbing Illicit Supply Proves Tough

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A man stands on a makeshift bridge over the Cannonball River while police officers stand on the opposite shore. Stephanie Keith/Reuters hide caption

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Stephanie Keith/Reuters

Protesters, Police Still Clashing Over Disputed North Dakota Pipeline

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President Obama speaks alongside Terry Cunningham of the International Association of Chiefs of Police during a conversation on community policing and criminal justice in July in Washington, D.C. Alex Wong/Getty Images hide caption

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Lawyer Anthony Douglas Rappaport speaks at a news conference with his clients, Denise Huskins and her boyfriend Aaron Quinn (right) in San Francisco on Thursday. Sudhin Thanawala/AP hide caption

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Sudhin Thanawala/AP