In New York, the governor put aside money to make sure that the state could purchase Chevy Tahoes so the cops could be higher than the average car. This way, the cop looks down, sees your texting and you get a ticket.
In Connecticut, there is someone that stands on an overpass where they can see inside the cars travelling slowly below. They then radio a cop below and tell him who to pull over.
In Tennessee, the cops purchased 18 wheelers so they can see inside. Only problem is that it is not easy to get out to give a ticket to the driver. Problem solved. The cop will radio someone in a patrol car to issue the ticket.
Does any of this sound like a violation to your privacy? Well, the problem is this type of behavior is actually legal thanks to the plain view doctrine. If the police can see it in plain view, it is theirs to use.