Utah Window Tint Law

41-6-149. Windshields and windows -- 
          Obstructions reducing visibility -- 
          Wipers -- Prohibitions.

(1) Except as provided in Subsections (2) and (3), a person may not 
    operate a motor vehicle with:
    (a) a windshield that allows less than 70% light transmittance;
    (b) a front side window that allows less than 35% light transmittance;
    (c) any windshield or window that is composed of, covered by, or treated 
        with any material or component that presents a metallic or mirrored 
        appearance; or
    (d) any sign, poster, or other nontransparent material on the windshield, 
        sidewings or side windows of the motor vehicle other than a 
        certificate or other paper required to be so displayed by law.

(2) Nontransparent materials may be used:
    (a) along the top edge of the windshield if the materials do not extend
        downward more than four inches from the top edge of the windshield
        or beyond the AS-1 line whichever is lowest;
    (b) in the lower left-hand corner of the rear window provided they do 
        not extend more than three inches to the right of the left edge or 
        more than four inches above the bottom edge of the window.
    (c) on the rear windows.

(3) A windshield or other window is considered to comply with the 
    requirements of Subsection (1) if the windshield or other window 
    meets the federal statutes and regulations for motor vehicle window 
    composition, covering, light transmission, and treatment.

(4) Except for material used on the windshield in compliance with Subsections
    (2)(a) and (b), a motor vehicle with tinting or nontransparent material
    on any window shall be equipped with rear-view mirrors mounted on the
    left side and on the right side of the motor vehicle to reflect to the
    driver a view of the highway to the rear of the motor vehicle.

(5)
    (a) The windshield on every motor vehicle shall be equipped with a device 
        for cleaning rain, snow, or other moisture from the windshield. The 
        device shall be constructed to be operated by the driver.
    (b) Every windshield wiper on a motor vehicle shall be maintained in good 
        working order.

(6)
    (a) A person may not have for sale, sell, offer for sale, install, cover, 
        or treat a windshield or window in violation of this section.
    (b) A person who violates this section is guilty of a class C misdemeanor.

(7) Notwithstanding this section, any person subject to the federal Motor 
    Vehicle Safety Standards, including motor vehicle manufacturers, 
    distributors, dealers, importers, and repair businesses, shall comply 
    with the federal standards on motor vehicle window tinting.