Is Automotive Window Film Legal?

YES!

Window film is legal however, the laws regarding the light blockage varies from state to state. Vehicles registered in Missouri may have the windows to the immediate right and left of the driver tinted to 35 percent, plus or minus three percent or more light transmittance. Windows behind the driver and the rear glass are not subject to tint limitations. The windshield is not to be tinted except that portion at the top.