For West Virginia, there isn't a sticker to verify its of legal tint on each window. And my understanding is anything from the front doors and foward have to be 35% tint or lighter. Everything behind the front doors can be as dark as you want.
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Texas
2003
Tint Darkness
Windshield
Non-reflective tint is allowed along the top of the windshield above the manufacturer's AS-1 line.
Front Side Windows
Must allow more than 25% of light in.Back Side Windows
Must allow more than 25% of light in.Rear Window
Any darkness can be used.
Tint Reflectiveness
Front Side Windows
Must not be more than 25% reflective.Back Side Windows
Must not be more than 25% reflective.
Other Rules and Regulations
Restricted Colors
The tint color(s) of RED BLUE AMBER are not legal by state law.Side Mirrors
Dual side mirrors are required if back window is tinted.Certificate Requirements
Manufacturers of film need to certify the film they sell in the state. Ask your dealer if they are using ceritified film.Sticker Requirements
The sticker to identify legal tinting is required between the film & glass on the driver’s side window.Medical Exemption
State allows medical exemptions for special tint. For more details about the specific terms of the exemption, consult your state law.
This one makes the most sense.
Ontario, New Brunswick, Newfoundland - For the driver’s compartment, right and left, no film can be installed that would substantially obscure visibility from the exterior. Behind the driver’s compartment, any film can be installed.