The Iraqis are cracking down on all of the criminals that Saddam released. It appears that they are just doing massive sweeps, bringing in everyone that they can find. Then taking them to another location and ID's them.
The operation netted more arrests than anticipated and brought in suspected drug dealers and weapons traders, Reuters reported.
Which begs the question, why didn't the American do something like that? We would have netted a large amount of criminals and cleaned up the streets a bit, which would have made things safer (on a general crime level, though it probably would not have helped solve the insurgent problems).
Were we ill equipped to do something like that, was it outside of out mandate, or did we leave some easier activities to the Iraq police force in order to get them trained fully.
I really have no idea.