Look for a resurgence of the Dead Rabbits this Summer.
First off, I don't know the details of the case against the AB. But I assume that whatever it is, somewhere drugs come into it. Possibly, the AB has a relation with the drug cartels. At some point, it could occur to the AB that for a relatively cheap price, prosecutors and judges can be assassinated. Why bother with the cops and detectives if the people who try the cases can be intimidated into not prosecuting?