Cal. GOV § 11013

The director of any state department, subject to approval of the Department of General Services, may establish and maintain, or by contract or otherwise cause to be established and maintained by any person or organization, at any institution under the jurisdiction of such department, a store or canteen for the sale to, or for the benefit of, inmates, patients and other persons entitled to institutional services, or employees of such institution, of candies, tobacco products, packaged food, nonalcoholic beverages and other articles. Such stores or canteens shall be conducted subject to rules and regulations of the department and rental, utilities and service charges shall be fixed and collected from such stores or canteens in an amount sufficient to reimburse the institution for its costs in connection with such store or canteen. The store or canteen when conducted by the institution or under the direction of the superintendent thereof, shall be operated on a nonprofit basis. Any profit derived by the institution from any store or canteen shall be deposited for the use and benefit of said inmates, patients or persons entitled to institutional services.

This section shall not apply to any institution at which a store or canteen is authorized to be established under existing law.