Utah Law permits the use of window tint on vehicles registered here in Utah. The limitations are as follows. All windshields are prohibited from having window tint, or other non-transparent material placed below the AS-1 line or 4 inches down from the top of the windshield, whichever is lower. The driver and front seat passenger side windows must not allow less than 43 percent light transmittance. All other windows behind the front seat have no minimum light transmittance requirements. Although, if the windows behind the driver’s seat are tinted, the vehicle must have both the outside rear-view mirrors on the left and right side of the vehicle. Any window tint that is present on any vehicle must not be treated with a material, which presents a metallic or mirrored appearance when viewed from the outside of the vehicle. According to Federal Law, commercial vehicles are prohibited from having any window tint. If you have additional questions on this subject, please contact the Safety Inspection Section at (801) 965-4889 Option 1.