In CA the violation is a Fix-It ticket.
1. Have the tint removed and have a cop or court official sign off on it and send in the ticket and that would be that!
2. Pay the fine about $150.00 and keep the tint on. If you are cited again tint must be removed.
Illegal equipment most often cited by the CHP:
•Loud Stereo if heard more than 50 feet from the vehicle.
•Lack of front and rear DMV-issued license plates.
•Radar detectors are legal, but jammers, or any device which interferes with radar signals.
•Lowered frame that is lower than the lowest point of the wheel rim.
•Air and hydraulic suspension systems that are operated unsafely or with the vehicle lower than allowed.
•Tinting the front side windows and the windshield (except for a narrow band at the top of the windshield). Windows behind the driver's head may be tinted. If rear window is tinted, right-side mirror is required.
•Lack of white rear license plate light. It must illuminate the license plate, not project light behind the vehicle.
•Missing front and/or rear bumpers
Illegal Engine Modifications:
•Air Cleaner Modification - modifications to the air cleaner and/or its housing.
•Air Filter/Intake Modification - open element air filters, modifications to the air flow intake tract, heat risers/preheat ducts.
•Kits that include multiple engine modifications such as new cylinder heads and camshafts, or boring and stroking; engine changes using an engine certified for another late model vehicle application, with additional engine modifications .
Exhaust System/Exhaust Modification - exhaust manifold, exhaust headers, exhaust pipes, crossover pipes.
•Fuel Line Modification - devices designed to attach to or be inserted in the fuel line.
•Fuel System Modification - fuel filters, gas caps, pressure regulators.
•Intake/Exhaust System - a kit that includes both intake and exhaust components.
•Blue and yellow headlights. Headlights must be white - blue and yellow are illegal. Look for the DOT symbol on the bulb and package.
•Headlights brighter or higher wattage than those from the factory. You may be able to see better, but the lights are illegal.
•Tail lights other than red.
•Illegal brake lights. Brake lights on vehicles newer than 1979 must be red.
•Lack of rear reflectors. Two red reflectors are required on the rear of cars and trucks.
•Incorrect color of turn signal. It must be white or yellow to the front, red or yellow to the rear.
•Red lights to the front. They are illegal except on emergency vehicles.
•Tail lights that incorporate a bulb with a red tint or coating. In general, custom tail lights that incorporate a clear outer shell and red inner lens are legal. If they don't incorporate reflectors, they must be added to the vehicle.
•Tail lights that are too dim, washed out or show yellow, white or other colors.
•Illegal color of side marker lights. If present, must be yellow in the front and red in the rear.
•Driving with just parking lights on. Vehicles that have factory-installed automatic daytime running lights must meet federal requirements and are legal.
•Illegal decorative lights. All flashing decorative lights are illegal.
•Illegal windshield washer nozzle lights. Only white or yellow are allowed.
•Lights attached to tire valves.
•Lighted license plate frames (unless red).
•Illegal lights, whether or not they are operating. It is illegal just to have them on the vehicle.
others say its to keep the car cool for the K9..and they didn't even drive the K9 car! 
The last cop I asked was a DEA and said that the tint keeps people from seeing the drugs that they might have in the back seat?? Put it in the trunk for gosh sake
I am sorry but all my cars are tinted. I have 5% tint on the Viper and the TA. I have an excuse of my own.....I think that you are less likely to get car jacked at a traffic light with tint. The criminal is less likely to approach your car if they can't see who is behind the glass. 
