Ariz. Rev. Stat. § 28-2354 – License plates; attachment; civil penalty

A. A person shall display the license plate or plates as follows:
1. 1. For a motor vehicle, motorcycle, trailer or semitrailer, on the rear.
2. 2. Except as provided in paragraph 3 of this subsection, for a vehicle for which two license plates are issued, the vehicle owner shall display either of the following:
  1. (a) One plate on the rear.
  2. (b) One plate on the front and one plate on the rear.
3. 3. For a vehicle for which two special license plates are issued pursuant to section 28-2409, one plate on the rear of the vehicle and one plate on the operator's wheelchair carrier or wheelchair lift when it is attached to the vehicle.
B. A person shall display all license plates as required by subsection A of this section until their lawful use expires or is canceled or revoked. A person shall maintain each license plate so it is clearly legible. A person shall securely fasten each license plate to the vehicle as follows:
1. 1. To prevent the plate from swinging.
2. 2. At a height of at least twelve inches from the ground to the bottom of the plate.
3. 3. In a position to be clearly visible.
C. A person shall maintain each license plate so that the name of this state at the top of the license plate is not obscured.
D. Unless authorized by the department, a person shall not apply a covering or any substance to the license plate or use an electronic device or electrochromatic film that obscures from any angle the numbers, characters, year validating tabs or name of the jurisdiction issuing the plate.
E. A peace officer shall not stop or issue a citation to a person operating a motor vehicle on a highway in this state for a violation of subsection C of this section unless the peace officer has reasonable cause to believe there is another alleged violation of a motor vehicle law of this state.
F. If a person violates subsection C of this section, the person is subject to a civil penalty of thirty dollars, except that if a person violates subsection C of this section within twelve months after the date of a prior violation of subsection C of this section, the person is subject to a civil penalty of one hundred dollars.