Judy Scott, the mother of Walter Scott who was shot and killed while fleeing a traffic stop in April of 2015, speaks to reporters outside the federal courthouse in Charleston, S.C., on Wednesday, May 11, 2016. Prosecutors on Wednesday unsealed an indictment charging white former police officer Michael Slager with three federal counts in the death of Scott. Slager already faces a murder charge in state court. (AP Photo/Bruce Smith) 

rom left, Baltimore Police Officer Edward Nero, and attorney Jason Silverstein, walk to Courthouse East before hearing on Tuesday, May 10, 2016 in Baltimore. A judge will rule on several motions ahead of the trial for Nero, one of the police officers charged in the death of Freddie Gray. Nero faces assault, reckless endangerment and misconduct in office. Gray died April 19, 2015, a week after suffering a critical spinal injury in the back of a police van. (Kim Hairston/The Baltimore Sun via AP)  

Community activist Margaret Prescod, from left, Porter Alexander Jr. and his wife Mary, in red, whose daughter Alicia, 18, was shot and strangled, meet reporters in Los Angeles Superior Court on Thursday, May 5, 2016. Lonnie Franklin Jr., a former Los Angeles trash collector, was convicted Thursday of 10 counts of murder in the "Grim Sleeper" serial killings, including Alicia, that targeted poor, young black women over two decades. (AP Photo/Nick Ut) 

In this April 21, 2016, photo, Candelario Jimon Alonzo, 16, stands in the yard of his uncle's home in Memphis, Tenn. Local school officials have kept Jimon out of the classroom since he tried to enroll in January. Attorneys say Jimon and at least a dozen other Central American unaccompanied youths have been blocked from going to high school in Memphis because officials said the teens lacked transcripts or were too old to graduate on time. (AP Photo/Karen Pulfer Focht) 

In this Aug. 29, 2010, file photo, a security camera hangs on the side of the Skyline School in Portland. The latest government snapshot of school crime paints a picture of safer schools with declines in violent crime, bullying and harassment because of sexual orientation. The report indicated that schools are taking steps to reduce crime. About 75 percent used security cameras during the 2013-2014 school year and more than 9 in 10 controlled access to their buildings. (AP Photo/Rick Bowmer, File) 

Republican presidential candidate Donald Trump speaks during a primary night news conference, Tuesday, May 3, 2016, in New York. (AP Photo/Mary Altaffer) 

In this Feb. 16, 2016, file photo, Lonnie Franklin Jr., left, appears in Los Angeles Superior Court for opening statements in his trial in Los Angeles. The “Grim Sleeper” serial killer trial is coming to a close in Los Angeles after months of testimony. Closing arguments were scheduled to begin Monday, May 2, 2016, in the trial of Franklin. He’s charged with killing nine women and a 15-year-old girl between 1985 and 2007. They were shot or strangled and their bodies dumped in alleys and trash bins in South Los Angeles and nearby areas. (Al Seib/Los Angeles Times via AP, Pool, File)