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 Florida, window tint laws are governed by the Florida Statutes, specifically Chapter 316.2951 - 316.2957, which regulate the amount of light transmission (VLT) and reflection (VLR) allowed for vehicle windows. Florida law stipulates that the front side windows must allow more than 28% of light in (28% VLT), and the back side and rear windows must allow more than 15% of light in (15% VLT). The windshield may have non-reflective tint along the top, typically not extending more than 6 inches down. The VLR for front and back side windows must not be more than 25%. Florida recognizes medical exemptions for individuals who require a lower VLT due to certain medical conditions, and these individuals must have proper documentation. If a driver is cited for illegal window tint in Florida, it is considered a noncriminal traffic infraction, which is a correctable violation. The driver can rectify the issue within a specified period, pay a dismissal fee, and have the vehicle re-inspected to avoid further penalties. Failure to comply can result in fines and additional citations, which may affect the driver's record. Noncompliance may also lead to a court appearance, and ignoring court orders could potentially lead to a warrant for arrest.