Is it legal to have dark tinted windows on the driver’s front window?

Is it legal to have dark tinted windows on the driver’s front window?

Inland Valley Daily Bulletin
Q: Leslie Swor of Riverside said she thought it is illegal to have dark tinted windows, especially with regard to the driver’s front window. She said, “I see many vehicles with dark tinted windows. Is there enforcement of this practice and why are vendors allowed to tint windows so dark that you cannot see inside the vehicle?
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