California Code, Penal Code - PEN § 4115.56

(a) Upon agreement with the sheriff or director of the county department of corrections, a board of supervisors may enter into a contract with the Department of Corrections and Rehabilitation to house inmates who are within 60 days or less of release from the state prison to a county jail facility for the purpose of reentry and community transition purposes.

(b) When housed in county facilities, inmates shall be under the legal custody and jurisdiction of local county facilities and not under the jurisdiction of the Department of Corrections and Rehabilitation.