Why do some states let you have window tint as dark as you want while others wont?

why do some states let you have window tint as dark as you want while others wont?Why do some states let you have window tint as dark as you want while others wont?
it's the law, cops like to see inside a car if there are going to pull it over.Why do some states let you have window tint as dark as you want while others wont?
it's a law, and in that state, the law passed that your windows must be no more than X amount of tint. Same as how in some states you can't turn right on a red, but others you can.. or some states you get a larger fine for speeding 15 over than you would in even the state one over.