by Rosalind Adams, BuzzFeed

TULSA, Oklahoma — By the time police arrived at the psychiatric hospital, one of the adolescent units was out of control. The new manager had been attacked, a handful of its teenage patients had barricaded themselves in a small room, and others were fighting with staff.

The officers called for backup, and three more police cars pulled up to Shadow Mountain Behavioral Health, which primarily treats young people. A “code green” blared over the intercom system, alerting employees across the hospital to the violence.

When a staff member unlocked the room the patients had shut themselves in, police pepper-sprayed the kids inside.

In the tumult, one staff member reported being stabbed in the forehead with a pencil. Outside, a patient scaled the 10-foot fence and, as employees watched in horror, began slicing his wrists with a piece of glass, three employees recently recalled. Running to reach him, another worker stepped in a hole and injured his ankle.

“It was crazy, mass chaos,” said an employee who saw the scene unfold.

Shadow Mountain is owned by America’s largest psychiatric hospital chain, Universal Health Services. A recent BuzzFeed News investigation raised grave questions ...