if you really don't wanna get rolled for it... don't tint the front 2 at all... a good general rule is if they can't see you perfectly clearly thru ur front windows... they will add it onto the speeding/wreckless/stop sign ticket that your about to get... i have limo(15%?) all the way around and double limo on the back... and never got in trouble for it.. and there is no allowance in CA... but if you don't wanna risk it... don't tint the front 2 and do 35% all the way around