Xiaoxing Xi, a Temple University physics professor, speaks in front of a photo of Sherry Chen, a federal government worker, at a September 2015 Washington, D.C., press conference about the spying charges against them that were dropped. Xi says his wife and daughters were marched out of their bedrooms at gunpoint when he was arrested in May 2015. Saul Loeb/AFP/Getty Images hide caption

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The Fine Line Between Countering Security Threats And Racial Profiling

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Former Los Angeles County Sheriff Lee Baca has withdrawn his guilty plea and chosen to go to trial on a charge of lying to federal investigators about allegations of corruption in his jail. Nick Ut/AP hide caption

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This undated artist' sketch shows the skyjacker known as D.B. Cooper from recollections of the passengers and crew of a Northwest Airlines jet he hijacked between Portland and Seattle on Thanksgiving eve in 1971. AP hide caption

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Democratic presidential candidate Hillary Clinton, former secretary of state, during a campaign rally in Charlotte, N.C. Justin Sullivan/Getty Images hide caption

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Law enforcement officials block off the road near Pulse nightclub on June 15 as they continue the investigation into the shooting there. The Justice Department on Monday released a transcript of a 911 call that Omar Mateen made the night of the shooting. Joe Raedle/Getty Images hide caption

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Three different law enforcement drawings show a suspected serial killer believed to have committed at least 12 murders and 45 rapes across California in the '70s and '80s. Sacramento County Sheriff Scott Jones, FBI Special Agent in Charge Monica Miller and Sacramento District Attorney Anne Marie Schubert displayed the images at a news conference in Sacramento, Calif., on Wednesday. Rich Pedroncelli/AP hide caption

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Facebook's Moments app uses facial recognition technology to group photos based on the friends who are in them. Amid privacy concerns in Europe and Canada, the versions launched in those regions excluded the facial recognition feature. Facebook hide caption

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Attorney General Loretta Lynch tours a factory where inmates work at the Talladega Federal Correctional Institution in Talladega, Ala. on April 29, 2016. Evan Vucci/AP hide caption

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Training Helps Inmates Build A Bridge To Life Outside Prison Walls

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FBI Director James Comey testifies March 1 before the House Judiciary Committee on the encryption of the iPhone belonging to one of the San Bernardino attackers. Nicholas Kamm/AFP/Getty Images hide caption

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