COLUMBIA — Noise echoed off the graffitied concrete walls. An inmate screamed. Inside a cell at South Carolina's Juvenile Detention Center, the cries of a teenage boy bounced from wall to wall, rendering his words almost incoherent. An officer stood in the doorway, speaking softly. The state's juvenile justice director, Eden Hendrick, quickly cut short a tour of the unit and ushered a reporter away. "I don’t want you to get stabbed,” she explained.