Tennessee Window Tint: 35% on Every Window, 70% Windshield

The controlling provision is T.C.A. § 55-9-107. Subdivision (a)(1) makes it unlawful to operate on a Tennessee highway, street or road any vehicle whose windows have been "altered, treated or replaced" with material that either has a visible light transmittance of less than thirty-five percent (35%), or, with the exception of the manufacturer's standard installed shade band, reduces windshield transmittance below seventy percent (70%). Tennessee therefore does not draw its windshield line at a strip depth or an AS-1 marking the way several neighbouring states do. It draws it at a light figure, and the only band it forgives is the tint the manufacturer built into the glass.

Because the 35 percent floor is written against "any window," Tennessee does not run the familiar front-versus-rear split. The front side windows, the rear side windows and the back glass are all held to the same 35 percent. The narrow relief in subdivision (a)(6)(A) covers four cases: a vehicle model that federal regulation permits to carry darker glass in certain windows, a vehicle on commercial or government service plates used for law enforcement (for the windows rearward of the front doors only), a vehicle registered in another state that meets that state's requirements, and a vehicle owned or leased by a private investigator or investigations company licensed under title 62, chapter 26. Subdivision (a)(6)(B) then closes the door on the obvious workaround: none of those exemptions reaches the front door windows of any vehicle of any kind.

Tennessee regulates the installer as tightly as the driver. Anyone who applies film "for profit, barter, or wages or commissions" is a professional installer under (a)(2), and it is a separate offense for that installer to tint a car into non-compliance. Under (a)(3) the installer must affix a label to the lower right corner of the driver's window carrying the business name and the legend "Complies with Tennessee Code Annotated, § 55-9-107." Under (a)(4) the customer must also get a signed receipt showing the installation date, the make, model, paint colour and plate number and state, a compliance legend, and the instruction that the receipt be kept with the registration documents. Subdivision (a)(5) then places the burden of proof of compliance on the vehicle owner, which is why that receipt matters in practice.

The medical route is a real one, and it runs through the Department of Safety rather than a doctor's note in the glove box. Under (b)(1), a person whose medical condition is adversely affected by ultraviolet light submits a physician's statement to the commissioner of safety; the commissioner refers it to the department's medical review board, which evaluates the request and, if warranted, recommends both the exemption and the degree of tinting appropriate. The commissioner then issues a certificate or decal stating the degree of exemption, and it must be displayed in the vehicle. Under (b)(2) an applicant aggrieved by the board or the commissioner appeals under the Uniform Administrative Procedures Act in title 4, chapter 5, and may take the appeal to the chancery court of the county where the applicant lives.

Enforcement is a roadside measurement, not a garage check. Tennessee's code sets no annual or periodic safety inspection for passenger cars, and the one statewide periodic scheme it ever had, the emissions inspection and maintenance program under the Tennessee Air Quality Act, was switched off by T.C.A. § 68-201-119(b)(1), which bars an inspection and maintenance program anywhere in the state except in a county that had its own local air pollution control program on May 15, 2018 and voted to continue it. What is left is § 55-9-107(c) and (e): an officer who reasonably believes a car violates (a)(1) may detain it for a field comparison test, and the commissioner of safety is directed to establish a standardized method by which officers can conduct that test readily and with reasonable accuracy. Public Chapter 602 of 2024 rewrote the section to replace "full-time, salaried police officer" with "POST-certified law enforcement officer" wherever it appeared, so the officer conducting the test must hold Peace Officer Standards and Training certification.

00), or both. Subsection (d) creates a second, independent Class C misdemeanor for a driver who refuses to submit to the field comparison test when a POST-certified officer directs it, so refusing the meter is itself the offense and does not defeat the stop. The same subsection reaches the shop as well as the driver, since a professional installer who tints a car out of compliance violates (a)(2) and is exposed to the same penalty. A driver stopped for tint should expect the officer to meter the glass on the spot under the commissioner of safety's standardized procedure; because (a)(5) puts the burden of proving compliance on the owner, the installer's window label and dated receipt required by (a)(3) and (a)(4) are the practical defence.

A medical exemption is only good if the certificate or decal issued by the commissioner is actually displayed in the vehicle, and a denial is challenged through the Uniform Administrative Procedures Act rather than in traffic court.