All states have traffic laws that limit the amount of window tint on motor vehicles—often by specifying the amount of visible light transmission (VLT) that is required. VLT is the amount of light that is transmitted through the window and into the vehicle. For example, a 70%VLT means that 70% of light will pass through the window and 30% will be reflected. Thus, a lower VLT indicates a darker film or tint.

Another term to know is visual light reflection (VLR)—which is the opposite of VLT. VLR is the amount of solar energy that is reflected off the glass and away from the inside of the vehicle.

In most states tickets or citations for illegal window tint are known as fix-it tickets and the ticket or citation will indicate that it is a correctable violation of traffic laws. For example, if you fix the window tint problem within the required period, pay a small fine, and get the signature of an authorized person (a local police officer) the court may dismiss the ticket.

But if you fail to fix the window tint problem within the required period you must pay the fine for the violation and you may be issued another ticket that will be part of your driving record. And if you fail to pay the ticket or appear in court on the hearing date the court may issue a warrant for your arrest.

Window tint laws vary from state to state and some states have exemptions for certain vehicles such as limousines and recognize medical exemptions when the driver has a written statement from a licensed medical doctor, ophthalmologist, or optometrist.

In Kentucky, window tint laws are outlined in the state statutes, specifically in KRS 189.110. These laws regulate the VLT level that is permissible for use on motor vehicles to ensure that the tinting is not too dark. Kentucky law requires that the front side windows and the windshield must allow over 35% of the light to pass through. The rear windows and back glass can be tinted to any darkness. The VLT refers to the percentage of light that is allowed through the tint film and the window glass combined. The state also specifies the VLR, which is the amount of light that the tint reflects away from the vehicle. Kentucky does allow certain exemptions for medical reasons; individuals with a medical condition that requires protection from the sun may be granted an exemption if they have the proper documentation from a licensed physician. If a driver is cited for illegal window tint in Kentucky, it is typically considered a 'fix-it' ticket. This means that the driver can have the tint removed or altered to comply with the law, pay a fine, and have the violation dismissed upon verification by an authorized person, such as a police officer. Failure to correct the issue within the specified time frame can result in fines and the violation being added to the driver's record. Ignoring the ticket or failing to appear in court can lead to further legal consequences, including the issuance of a warrant for arrest.