One report found that inmates who suffered from serious mental illnesses spent six and half times longer in disciplinary units than other inmates generally.

The administrative and disciplinary unit (SHU) can hold 238 inmates.

The study was prepared by a 24-member investigative team reporting to the Office of Professional Responsibility, the Justice Department's internal disciplinary unit.

He considers Adrian's attitude grounds enough for him to be set back and placed in the Motivational Platoon, a disciplinary unit for problem recruits.

Still, as Mr. Kerik tries to resolve the legacy of problems at the central disciplinary unit, he faces hurdles.

Prisoners in the chronic disciplinary unit sit alone in their cells - no books, paper, pencils, posters, mail, radio or television - 23 hours each day.

It is possible that Chase is so "wildly out of control" that a harsh disciplinary unit makes little sense in his case.

The barber was placed in the disciplinary unit.

The administrative and disciplinary unit, called the Special Housing Unit, can hold approximately 250 inmates.

Cells in the disciplinary unit have showers and are occupied by two inmates.