Detainees at the Northwest Detention Center in Tacoma, Wash., gather for a Sikh prayer service. Liz Jones/KUOW hide caption

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Boys wait in line to make a phone call at the U.S. Customs and Border Protection Nogales Placement Center in Arizona in June. Many of the minors who arrived from Central America last year are now awaiting court hearings to determine if they can stay in the U.S. Ross D. Franklin/Pool/Getty Images hide caption

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People celebrate after California Gov. Jerry Brown signed bill AB60 on Oct. 3, 2013, in Los Angeles. Also known as the Safe and Responsible Driver Act, it allows undocumented immigrants to apply for state driver's licenses. Kevork Djansezian/Getty Images hide caption

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The Supreme Court in Washington, D.C., voted against Arizona's appeal, which would have allowed a state ban on driver's licenses for young undocumented immigrants. Carolyn Kaster/AP hide caption

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Lori Baker with her husband, Erich. Baker is founder and executive director of the International Consortium for Forensic Identification, Reuniting Families Project. StoryCorps hide caption

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Migrants arrive at a rest stop in Ixtepec, Mexico, after a 15-hour ride atop a freight train headed north toward the U.S. border on Aug. 4. Thousands of migrants ride atop the trains, known as La Bestia, or The Beast, during their long and perilous journey through Mexico to the U.S. John Moore/Getty Images hide caption

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