Louisville Metro Police Department Interim Chief Jacquelyn Gwinn-Villaroel, along with other city and federal officials, discuss the civil rights investigation at a press conference on Wednesday. Louisville Mayor Craig Greenberg (L) and U.S. Attorney General Merrick Garland (R) are standing to her left. Luke Sharrett/AFP via Getty Images hide caption
Police vehicles are parked outside the headquarters of the Yonkers Police Department in Yonkers, N.Y. Since 2007, the U.S. Department of Justice has been investigating the Yonkers Police Department and recommending areas for reform. José A. Alvarado Jr. for NPR hide caption
Terrence Floyd speaks during a news conference during the unveiling of three sculptures as part of the "SEEINJUSTICE" art exhibition that feature the likenesses of his brother George Floyd, Breonna Taylor, and John Lewis, Thursday, Sept. 30, 2021, at Union Square in the Manhattan borough of New York. John Minchillo/AP hide caption
President Biden and first lady Jill Biden attend the 40th Annual National Peace Officers' Memorial Service at the U.S. Capitol on Saturday. Brendan Smialowski/AFP via Getty Images hide caption
Maryland Gov. Larry Hogan, far right, Baltimore County Executive John Olszewski and Maryland House Speaker Adrienne Jones stand next to a new historic marker on Saturday in Towson, Md., that memorializes Howard Cooper, a 15-year-old who was dragged from a jailhouse and hanged by a mob in 1885. Brian Witte/AP hide caption
Law enforcement officials look down from the rooftop as people gather near a press conference regarding the death of Andrew Brown Jr. in Elizabeth City, N.C. Joe Raedle/Getty Images hide caption
Kentucky Gov. Andy Beshear signs a bill on Friday limiting the use of no-knock warrants statewide. The governor was surrounded by members of Breonna Taylor's family including her mother, Tamika Palmer (standing behind Beshear at left). Timothy D. Easley/AP hide caption
Police are "responding to nonviolent, noncriminal calls for service for people whose needs are largely social, behavioral or mental. And that's just not right," says San Francisco Fire Capt. Simon Pang, who's helping to spearhead efforts to create new mobile crisis teams for the city. Eric Westervelt/NPR hide caption
Rochester, N.Y., Mayor Lovely Warren, seen at a Sept. 3 news conference, announced a series of personnel actions and reforms on Monday following a preliminary review of the city's handling of the events following the March arrest and death of Daniel Prude. Adrian Kraus/AP hide caption
Laurie Robinson, left, professor of criminology at George Mason University, and Charles Ramsey, right, Philadelphia police commissioner, listen while President Obama discusses law enforcement recommendations from his Task Force on 21st Century Policing in March 2015. Brendan Smialowski/AFP via Getty Images hide caption
Mayor Quinton Lucas talks to demonstrators during a rally in Kansas City, Mo., on June 5, to protest the death of George Floyd. Charlie Riedel/AP hide caption
Los Angeles Police Department Chief Michel Moore speaks to a protester after a vigil with members of professional associations and the interfaith community at LAPD headquarters, Friday, June 5, 2020, in Los Angeles. Mark J. Terrill/AP hide caption
Minneapolis Mayor Jacob Frey speaks Saturday with demonstrators calling for the defunding of his city's police department. Stephen Maturen/Getty Images hide caption
President Trump speaks during a roundtable discussion with law enforcement officials on Monday, at the White House. Seated with Trump are Kentucky Attorney General Daniel Cameron (left) and Patrick Yoes, national president of the Fraternal Order of Police. Patrick Semansky/AP hide caption
"We need to make a firm commitment to change, not just with words but with action," Los Angeles Mayor Eric Garcetti said on Wednesday. Richard Vogel/AP hide caption
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
A member of the New York Police Department stands in front of Trump Tower to provide security to U.S. President-elect Donald Trump on Thursday in New York. Timothy A. Clary/AFP/Getty Images hide caption
A woman speaks with an officer at a vigil outside Dallas police headquarters in Dallas on Friday. Bilgin Sasmaz/Anadolu Agency via Getty Images hide caption
Michelle Gross (right) is a member of the Committee for Professional Policing, which is proposing a ballot measure in Minneapolis that would require police officers to carry liability insurance. Martin Kaste for NPR hide caption
After Freddie Gray's death, Baltimore erupted in protests, political action, and artistic expression. Chip Somodevilla/Getty Images hide caption