According to California window tint laws, the front side windows must have 70% light transmission or more, while back side windows and rear windows may have any tint darkness. Windshield tint is restricted to the top 4 inches, and no color-altering tint is permitted on any other windows. Red, blue, and amber tint film are not allowed on the front windshield. Dual side mirrors are required if the rear window is tinted. California drivers can apply for medical exceptions for tinting film, but the tint must be clear, colorless, and transparent, and drivers must have a certificate of authenticity from the tint installing company or the film manufacturer. It is important to note that California tinting laws and regulations may be interpreted differently in different counties or places of residence, so it is recommended to double-check with the local DMV or law enforcement authorities.