Summary Nearly half of recent cases in crackdown target minor offenses Large teams of federal agents assist in routine policework Effort turns up guns, large quantities of drugs WASHINGTON, Aug 27 (Reuters) - One night last week, police officers in Washington stopped a man carrying a designer handbag after spotting a small, clear plastic bag poking out of it, which they suspected might contain marijuana. It was the kind of encounter that is a staple of local police work, only this time the officers who asked to look inside the bag were accompanied by agents from five separate federal law...