I thought this never happened where I lived, because I have ridden thousands of miles without trouble, all those miles ridden as far as practicable to the right, but not one inch farther. In other words, most often in the center of the right hand traffic lane.
But not long ago, it became clear that cyclists here are not immune from police harrassment when riding safely and legally on public roadways. John Lindenmayer, the advocacy director of the League of Michigan Bicyclists, was ticketed for impeding traffic and fined $115 by a magistrate. With he assistance of a lawyer, he appealed to the judge and the fine was overturned. The article about this is quite interesting, especially the cop's attitude that John--a leading bike advocate--was an uppity cyclist "with long hair" who deserved punishment for blocking traffic on one of the busiest streets in the city (which also happens to be a major route for bicycle commuters).
http://www.lmb.org/index.php?option=...=162&Itemid=94