According to California window tint laws updated in 2023, the legal tint for front side windows must have 70% light transmission or more, while back side windows and rear windows may have any tint darkness. Windshields can only have non-reflective tint on the top 4 inches. 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 does not permit using red, amber, or blue tint colors, and side windows must be colorless. 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 local DMV or law enforcement authorities.