The legality of aftermarket vehicle window film, commonly referred to as window tint, is primarily governed by state laws within the United States. These regulations typically specify parameters such as the Visible Light Transmittance (VLT) percentage, which dictates how much light must pass through the tinted window, and restrictions on reflectivity. There is no single federal law mandating uniform window tinting standards across the nation.
Historically, states have enacted laws independently to address safety concerns related to visibility for drivers and law enforcement. Varying levels of enforcement and specific requirements lead to a patchwork of regulations across different jurisdictions. Considerations influencing these laws often involve balancing individual privacy with public safety. The implementation of window tint regulations predates the Trump administration.