Billboards Spying on People?

[Wolfeye]

Apparently, billboards in NYC (at the very least) are tracking people's cellphones. Don't know how much data they're gathering from it, but I remember something about them tracking people's EYE MOVEMENTS & their license plates. How is this shit not simply shut down? Doesn't really have to be legally or even with the consent of the business. What about the employees that develop & install these things? They probably think that what they do at work "counts." As reality. Which it would be if they got fired or killed.