California Code, Penal Code - PEN § 5026

(a) The Department of Corrections and Rehabilitation and the Department of Youth and Community Restoration shall cooperate with the United States Department of Homeland Security by providing the use of prison facilities, transportation, and general support, as needed, for the purposes of conducting and expediting deportation hearings and subsequent placement of deportation holds on undocumented immigrants who are incarcerated in state prison.

(b) For purposes of this section, “immigrant” means a person who is not a citizen or national of the United States.