Washington does have several other important laws, rules and regulations pertaining to window tinting. They include the following: Side Mirrors: Dual side mirrors are required in this state if back window is tinted. Restricted Colors: Yellow, red and amber window tints are not allowed by Washington law. Certificates: Film manufacturers need to certify the film they sell in the state of Washington. Check with your dealer if they are using certified film. Stickers: The sticker to identify legal tinting is required between the film & glass on the driver’s side window. Medical Exceptions: Washington allows medical exempt for special tint.