"I just panicked. I just, it was like my heart exploded," Rose Campbell told local WSB TV, after she was pulled from her vehicle and screamed at during an arrest over a traffic stop. Alpharetta Department of Public Safety hide caption

The video shows a white police officer choking a young tuxedo-clad man who is African-American, pushing him against a storefront and then slamming him to the ground outside a North Carolina Waffle House. Anthony Wall via Facebook/Screenshot by NPR hide caption

In this Aug. 25, 2017, image made from video and released by the Asheville, N.C., Police Department, Johnnie Jermaine Rush grimaces after officer Christopher Hickman overpowers Rush in a chokehold. Earlier this year, a shorter clip obtained by a newspaper sparked anger in the community and helped lead to a felony charge of assault by strangulation against former officer Hickman. Asheville Police Department via AP hide caption

Demonstrators in Miami stand with tape reading, " I Can't Breathe," in 2014. The protest occurred after a grand jury in New York City declined to indict the police officers involved Eric Garner's death. Joe Raedle/Getty Images hide caption

Looters load up a car at the Viva shopping center near a billowing fire during the rioting that erupted in Los Angeles on April 29, 1992, after a jury found four Los Angeles Police Department officers not guilty in the beating of Rodney King. Ron Eisenbeg/Michael Ochs Archives/Getty Images hide caption

Scenes from Let It Fall: Los Angeles 1982-1992. ABC Press hide caption

Los Angeles Police Chief Charlie Beck at a news conference in October. Nick Ut/AP hide caption

Roman Ducksworth in uniform. The Army corporal was shot to death by a white Mississippi police officer in 1962. Courtesy of Cordero Ducksworth and the Syracuse Cold Case Justice Initiative hide caption

K.A.A.N. stands for Knowledge Above All Nonsense. Dalton Latham hide caption

Demonstrators in Chicago call for an end to gun violence and resignation of Chicago Mayor Rahm Emanuel. Chicago police are under scrutiny following the release of a video showing the shooting of 17-year-old Laquan McDonald by a Chicago police officer. Scott Olson/Getty Images hide caption

Egyptian mourners carry the coffin of Mohammed Darbaka, who was allegedly shot dead by a policeman over a payment dispute, during his funeral on Feb. 19 in Cairo. AFP/AFP/Getty Images hide caption

New York City Police officers watch demonstrators protesting the death of Eric Garner near Times Square. Zoran Milich/Getty Images hide caption

A mural depicting peace in Ferguson was painted on the wall of a vacant building near the city's police department. David Goldman/AP hide caption

Fired police officer Daniel Holtzclaw cries as guilty verdicts are read in an Oklahoma City court Thursday. Holtzclaw could face life in prison when he's sentenced for rape and other charges next month. Sue Ogrocki/AP hide caption

Antwan Burns-Jones, 31 (from left), William Moore, 35, and David Lee, 23, add a basketball to the memorial for Tyshawn Lee, 9, who was fatally shot in Chicago's Gresham neighborhood. Chicago Tribune/TNS via Getty Images hide caption

Writer Ta-Nehisi Coates speaks onstage at the 2015 New Yorker Festival last month. Anna Webber/Getty Images for The New Yorker hide caption

Director Quentin Tarantino attends a march to denounce police brutality in New York City on Oct. 24. At the rally, Tarantino said, "I have to call the murdered the murdered, and I have to call the murderers the murderers" — drawing considerable backlash from police unions. Kena Betancur/Getty Images hide caption