Olivia López thought she’d be working with migrant mothers and children in a group-home setting when hired as a social worker at a Texas family detention center. But when she arrived at the concrete facility and the doors were unlocked to let her in, she was startled by the cacophony of cell doors clanging. “I walked in and thought, ‘oh my Lord, this is really a prison,’” she said. In an exclusive interview with McClatchy, López shared an inside perspective of troubling operations at the Karnes County Residential Center, which has been at the center of controversy over the Obama administration’s family detention policy. She described a facility where guards isolated mothers and children in medical units, nurses falsified medical reports, staff members were told to lie to federal officials and a psychologist acted as an informant for federal agents.