Keep right, pass left is nj law. Its pretty wise not to pass a cop; they take it personally. Especially if he/she is trying to slow down the flow of traffic. I did that once and he said he had to pull me over otherwise i'd ruin the example he was trying to set. He let me go which was cool. I have had no such luck as of late. I used to be able to talk my way out of pretty much any moving violation; now i talk myself into them.
DUke