A group of people walk on Castro Street, in the downtown portion of the Silicon Valley town of Mountain View, California, August 24, 2016. (Photo by Smith Collection/Gado/Getty Images). Smith Collection/Gado/Getty Images hide caption

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Smith Collection/Gado/Getty Images

A Milwaukee police officer stands before the remains of a bar last summer, after police there faced off with protesters following the police shooting of a black man. For decades, interactions between police and people of color in the Midwestern city have been fraught, and those encounters are the subject of a new lawsuit brought by the ACLU. AFP/Getty Images hide caption

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The wreckage of a car in one of the main streets of the Rose des Vents district in the Paris suburbs on Feb. 7. Geoffroy Van Der Hasselt/AFP/Getty Images hide caption

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In the video recorded by a neighbor, a police officer is seen using a stun gun on Judah Adunbi during an incident last Saturday in Bristol, England. ITV/Screenshot by NPR hide caption

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ITV/Screenshot by NPR

Newly hired Spokane County Sheriff's Deputy Russell Aldrich chats with strangers in a shopping mall. The exercise is meant to help rookies build up the subtle people skills that older police trainers claim are lacking among many millennial recruits. Martin Kaste/NPR hide caption

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Martin Kaste/NPR

In Social Media Age, Young Cops Get Trained For Real-Life Conversation

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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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Elizabeth Tracey Mae Wettlaufer, a former nurse accused of murdering eight elderly patients, leaves the courthouse Tuesday in Woodstock, Ontario. Geoff Robins /AFP/Getty Images hide caption

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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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Police tape is displayed at a crime scene in Chicago where a 16-year-old boy was shot in the head and killed and another 18-year-old man was shot in April. Joshua Lott/Getty Images hide caption

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Mourners and activists hold a candlelight vigil during a rally in El Cajon, a suburb of San Diego, Calif., on Wednesday, in protest of the police shooting the day before. Bill Wechter/AFP/Getty Images hide caption

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Police in El Cajon, Calif., provided this image, which they say is a still from a bystander's cellphone video of the shooting of an unarmed black man on Tuesday. Police say the man was pointing an object — which was not a weapon — at an officer. El Cajon Police Department hide caption

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El Cajon Police Department

Demonstrators take a knee during the national anthem outside Bank of America Stadium before an NFL football game between the Carolina Panthers and the Minnesota Vikings on Sunday in Charlotte, N.C. Protests have disrupted the city since Tuesday night, following the shooting of 43-year-old Keith Lamont Scott at an apartment complex in the city. Sean Rayford/Getty Images hide caption

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A protester demonstrates against the death of Keith Scott in front of police in Charlotte, N.C., on Wednesday. Brian Blanco/Getty Images hide caption

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Brian Blanco/Getty Images

Police Reform Is Happening, But It's Hard To Track

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