California Code, Vehicle Code - VEH § 24010

(a) No person engaged in the rental of any vehicle, for periods of 30 days or less, shall rent, lease or otherwise allow the operation of such vehicle unless all of the following requirements are met:

(b) In order to ensure compliance with this section, the department may conduct periodic inspections, without prior notice, of the business premises of persons engaged in the rental of vehicles for periods of 30 days or less and of the vehicles themselves, for the purpose of ascertaining that the vehicles are in compliance with this section.  Any vehicle which is found not in compliance shall not be rented or leased until proof of full compliance with this section is made to the satisfaction of the department.

(c) The contract or rental agreement shall include the name of the person from whom the vehicle is rented, leased or obtained, the address of that person's place of business in this state where the vehicle is rented, leased, or delivered, and a statement of any required equipment refused by the person to whom the vehicle is rented, leased, or delivered.