The U.S. Department of Justice has reached a settlement agreement with Los Angeles County and its Sheriff's Department that will bring its jails under court oversight to address the treatment of mentally ill inmates.

The settlement agreement was filed Wednesday along with a complaint alleging a pattern or practice of inadequate mental health care and excessive force in the jails that violate inmates' constitutional rights.

Once the agreement is approved in federal court, it will be overseen by an independent monitor and team of mental health and corrections experts.

It requires reforms such as new training, improved records keeping and communication between custody and mental health staff to prevent and respond to suicides and self-inflicted injuries. The agreement also expands measures against excessive force that were required in a prior class-action lawsuit, including improvements in leadership, policies, training, data collection and analysis, and grievance procedures.

The Sheriff's Department, which manages the largest jail system in the nation, has already started to implement many of the measures in the agreement. "The settlement agreement avoids protracted litigation and provides a blue print for durable reform," U.S. Attorney Eileen M. Decker said in a statement.