A mural memorializing Freddie Gray is painted on the wall near the place where he was tackled and arrested last year by police at the Gilmor Homes housing project in Baltimore, Md. Chip Somodevilla/Getty Images hide caption

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A Year After Freddie Gray's Death, Trials Set To Begin (Again)
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The anonymous Web surfing system Tor is run by volunteers — and sometimes they get caught between the police and criminal suspects. Daniel Acker/Bloomberg via Getty Images hide caption

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When A Dark Web Volunteer Gets Raided By The Police
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An image from a CHP video shows a Chihuahua leading officers on a chase across the Bay Bridge. California Highway Patrol/Screen shot by NPR hide caption

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Brittney Mills (center) stands with her mother, Barbara (left), and a family friend at her baby shower days before Brittney was killed. Aarti Shahani/NPR; Original photo courtesy of Barbara Mills hide caption

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Mom Asks: Who Will Unlock Murdered Daughter's iPhone?
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Authorities search for a suspect following the shooting that killed 14 people on Dec. 2, 2015, in San Bernardino, Calif. The public was able to follow the manhunt by listening to police radio communications streaming online. Chris Carlson/AP hide caption

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Police Radio Chatter Is Open To All Ears. But Should It Be?
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French criminologist Alphonse Bertillon's (left) techniques for identifying criminals in the late 19th century set the template that police use today. Mondadori Portfolio via Getty Images hide caption

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Meet Alphonse Bertillon, The Man Behind The Modern Mug Shot
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Suffolk County Chief James Burke speaks at a press conference held to announce the details of a officer-involved shooting in Bay Shore, Long Island on March 23, 2015. Christie. M Farriella via New York Daily News hide caption

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In N.Y., A Fight To Reform Police Force Accused Of Being 'Rotten'
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Daniel Holtzclaw (center) listens as Oklahoma County assistant district attorney Gayland Gieger (right) speaks during Holtzclaw's sentencing hearing in Oklahoma City, Thursday. Holtzclaw, a former Oklahoma City police officer, was convicted of raping and sexually victimizing several women on his beat. At left is defense attorney Scott Adams. Sue Ogrocki/AP hide caption

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Men identified as victims of police torture under the command of retired Chicago Police Commander Jon Burge stand to be recognized by the Chicago City Council in May. Charles Rex Arbogast/AP hide caption

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An LAPD officer trains inside a force option simulator at the police department's headquarters in March. Frank Stoltze/KPCC hide caption

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In LA, Renewed Focus On Training Police On When To Shoot, And When Not To
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Mourners gather for the funeral of Harris County Deputy Darren Goforth, killed as he pumped gas in a surprise attack in August. According to new national statistics, 42 police officers were shot and killed in 2015. Aaron M. Sprecher/Getty Images hide caption

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Number Of Police Officers Killed By Gunfire Fell 14 Percent In 2015, Study Says
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