A spate of high-profile police shootings nationwide, most notably the killing of a black teen in Ferguson, Missouri, has stoked intense scrutiny of deadly force by officers and driven a series of demonstrations across the nation and the Bay Area. But in Richmond, historically one of the most violent cities in the Bay Area, the Police Department has averaged fewer than one officer-involved shooting per year since 2008, and no one has been killed by a cop since 2007.