Cal. Penal Code § 6302

The Director of Corrections shall make rules and regulations governing eligibility for commitment or transfer to such camps and rules and regulations for the government of such camps. Subject to the rules and regulations of the Director of Corrections, and if there is in effect for the county a contract entered into pursuant to Section 6303, a county prisoner may be committed to a regional jail camp in lieu of commitment to a county jail or other county detention facility.