<S>
I live in Joisey, as far as a Warning is concerned, I would not be worried about it. You got lucky. Basically the Warning will stay on record(for the particular department that pulled you over-only), for I believe 3 months. They would only be changed to a Citation if you were caught for the same offense, by the same department(jurisdiction). I would not lose sleep over it though. Jersey State boys can be Jerks, but are usually very professional.
<S> Oz