I got a legal question regarding Tinted Windows on a car?

I'm from Chicago and got my car windows tinted like five years ago when there was no fine or punishment regarding tinted windows. After the first of the year they enforced a new law that the drivers windows cannot be tinted and if they are you have to scratch the tint off in front of the police officer and may... show more I'm from Chicago and got my car windows tinted like five years ago when there was no fine or punishment regarding tinted windows. After the first of the year they enforced a new law that the drivers windows cannot be tinted and if they are you have to scratch the tint off in front of the police officer and may recieve a ticket. Since I got my windows tinted before the law went into effect can I plead "Ex Post Facto"?
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