Similar to the experience someone had in Arizona with a rental car. The real problem for them is they cannot prove who was driving (unless the camera captures the driver's face), and without getting into all the particulars of the legal aspects, how can they impound someone's car when someone else was driving the car and speeding (assuming someone else was driving)? Seems like a stretch.
This comment seems like common sense:
"They sent another reminder letter but I ignored that too. So far nothing bad has happened. My research indicated theres nothing they can legally do. They can't prove it was me driving and they can't even prove I received notice of a citation because it was not sent certified mail."
Also, NJ has introduced legislation to make the mailing of out of state tickets to NJ drivers illegal. This was done several times, but don't think the bills went anywhere.
Idk how NJ can prevent other states from sending tickets. Sort through the mail?
They CAN prevent other states' tickets from giving you points here (NY does this).