I took the liberty to ask and it would seem that the tool that you refer to is known as a "tint meter".The amount of light that should pass through a window is 70%. As for telling a police officer that you want the window metered before he/she gives you a summons, that sounds a bit asinine. I'm sure that your 8 officers also told you that a large percentage of officers go through specialized training to be able to do things like summonses for tinted windows, speeding,auto crimes and others just to name a few. And I'm also sure that they told you to be confrontational when dealing with law enforcement. As far as enforcing out of state vehicles, when getting your cars inspection done one of the things that they check for is emissions. Which in California is different from NYS, basically what you are saying is that a car registered in NYS can not be driven in Ca and vice versa without adhering to the states emission laws. That makes absolutely no sense. Now you will have to excuse me, but I have many friends who are in law enforcement, in many ranks. and it is a bit irritating knowing that they put on a uniform and deal with things that you can't even imagine. They even go as far as making the ultimate sacrifice at times, just to deal with such ignorance. I bet your the same person that lets them know you pay the taxes that pays their salary, never stopping to realize that they pay the same taxes. Hope you understand the criticism.