I hate to say it, but I generally don't like the current scent system. It makes it almost impossible for any would-be thief to get away with their crimes.
I mean, why even include a thievery mechanic if you're going to make it possible for offline lawbreakers to be summoned for execution by someone following a scent trail?
Now, by this I don't mean that there shouldn't BE a system for tracking criminals, but I do believe that it should be a more difficult system. Perhaps a criminal could drop a cloth from his cloak, or leave a muddy footprint on a stone-paved road.
Also, to be quite honest, I'm not completely sure how tracking works, I haven't actually invested in Ranging/The black skills.