Yonkers community activist Hector Santiago demonstrates the "stop-and-shake" with Lt. Pat McCormack of the Yonkers Police Department. The idea, Santiago says, is to get people to introduce themselves to cops on the street. Courtesy of Hector Santiago hide caption

itoggle caption Courtesy of Hector Santiago

Sureshbhai Patel lies in a bed at Huntsville Hospital in Huntsville, Ala., on Feb. 7. Patel was severely injured when police threw him to the ground. Chirag Patel/AP hide caption

itoggle caption Chirag Patel/AP

New York City Police Commissioner Bill Bratton speaks during an NYPD swearing-in ceremony in New York on Jan. 7. He confirmed to NPR today that there had been a work slowdown by officers in the weeks since two police officers were shot dead. He said the matter was being corrected. Seth Wenig/AP hide caption

itoggle caption Seth Wenig/AP

There's been a sharp decline in the number of arrests and tickets and summonses issued in New York City. Police sometimes use work slowdowns to show dissatisfaction with policies, workloads or contract disputes. Justin Lane/EPA/Landov hide caption

itoggle caption Justin Lane/EPA/Landov

Members of the St. Louis Rams raise their arms to protest the grand jury decision in Ferguson, Mo., before a game last month. The players faced a backlash from St. Louis police and have been asked to apologize. L.G. Patterson/AP hide caption

itoggle caption L.G. Patterson/AP

Dontey Carter (from left), Mel Moffitt, Lenard Smith, Ned Alexander and Allen Frazier are all members of the Lost Voices group, formed after Michael Brown's death in August. They say they want to ensure justice for Michael Brown and other unarmed individuals killed by police officers. Cheryl Corley/NPR hide caption

itoggle caption Cheryl Corley/NPR

An inmate at Rikers Island juvenile detention facility carries a plastic fork behind his back as he walks with other inmates. A recent report found that juvenile detainees are subjected to routine violence, both by other inmates and by correction officers. Julie Jacobson/AP hide caption

itoggle caption Julie Jacobson/AP