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 South Carolina, window tint laws are defined under the state's Code of Laws. The state permits non-reflective tint on the top six inches of the windshield. For front side windows, the tint must allow more than 27% of light in (27% VLT). The back side and rear windows can have a tint that allows more than 27% of light in as well. The state also measures how much light is reflected by the tint, and the window tint must not be more than 20% reflective. South Carolina recognizes medical exemptions for individuals who require a darker tint due to medical conditions, and these individuals must have documentation from a licensed physician. If a driver is cited for illegal window tint in South Carolina, it is typically considered a fix-it ticket, which means the driver can correct the violation within a specified period, pay a fine, and potentially have the ticket dismissed upon verification by an authorized person, such as a police officer. Failure to comply with the correction period can result in fines and further citations, which may affect the driver's record. Non-compliance with court dates or ticket payments can lead to more severe consequences, including the issuance of an arrest warrant.