There is "Gangs of Mega-City One" by Mongoose (the Starship Troopers people) which is an officially licensed Judge Dredd tabletop game.
It's focus is more on block violence, but full rules for judges are in there.
We had a really fun campaign going for a while, but like all our campaigns it ran out of steam (not through lack of interest by the players, I might add. It was the GM, that feckless twit Chronoglide. His attention wandered as it always does on to something else. Damn tomfool of a ninny - I can say all this because he never visits LAF, he's a TMPer. Ha! Ha!).