Ariz. Rev. Stat. § 28-2166
A. The department of transportation shall not allow an owner who is engaged in the business of renting or who intends to rent a motor vehicle in this state without a driver to register or to rent the motor vehicle until either:
B. The policy of insurance required by subsection A of this section shall:
1. Insure the renter against:
C. Subject to subsection D of this section, the public liability insurance or the obligation of a self-insured owner pursuant to this section is primary coverage to any other available liability insurance coverage that is available and applicable for any damages and injury caused by a renter unless one of the following applies:
1. It is disclosed in the rental agreement to the renter the following:
"The owner does not extend any of its motor vehicle financial responsibility or provide public liability insurance coverage to the renter, authorized drivers or any other driver."
This disclosure shall be by one of the following methods:
D. The owner regulated by this section:
1. Shall respond to the third-party claim, provide financial responsibility as prescribed in subsection B of this section and provide a defense for all claims for damages or liability arising out of the ownership, maintenance or use of a motor vehicle if there is an accident, there are damages or injuries that are caused by the renter and one of the following applies: