California Code, Penal Code - PEN § 9500

(a) “Detention facility” means any facility in which persons are incarcerated or otherwise involuntarily confined for purposes of execution of a punitive sentence imposed by a court or detention pending a trial, hearing, or other judicial or administrative proceeding.

(b) “Private detention facility” means a detention facility that is operated by a private, nongovernmental, for-profit entity, and operating pursuant to a contract or agreement with a governmental entity.