Cal. Penal Code § 6225

Supervision of inmates in the restitution centers may be by contract with private nonprofit or profit corporations, or by peace officer personnel of the Department of Corrections on a 24-hour basis. As a condition to any contract awarded by the state to a vendor for restitution center operations, a peace officer from the Department of Corrections shall be assigned to the site to provide daily oversight and guidance of custody and security activities. The peace officer also shall be the liaison between the vendor and the department. If the supervision is by a private entity, the per inmate cost of operating these facilities under contract shall be less than the per inmate cost of maintaining custody of inmates by the department.