NYS has pretty tight *tint* laws. It's hard to determine how tinted is illegal considering auto parts stores in NY still sell tint that can be onsidered *illegal*
However the law is in effect for officer safety. They need to be able to see into the car and all and how many occupants.
Imagine being a police officer approaching and vehicle they just pulled over for driving 40 miles over the speed limit like they just robbed a bank and NOT being able to see into that vehicle??