On a sedan or coupe (determined by registration), rear and all side windows must ADMIT 70% of available light. No tint is allowed below the "AS1" line on the windshield. Most models come from the factory with this level of tint. Unscrupulous or misinformed installers will insist you are allowed to BLOCK 70%. This is not true. The tint level is NOT part of the state inspection procedure, thus may or may not pass, according to the whim of the mechanic, who is only required to make sure the windows are not "obstructed". Police with a measuring device "tint meter" may check this and cite accordingly. On a registered truck or station wagon (vans, suv), windows behind the driver's door are permitted any level of tint. Driver and front passenger doors must follow the 70% rule.