In this case, it happened in Richmond, California, where the police department has reduced policed involved shootings in what is one of the more violent cities in the Bay Area:

……….
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.

That track record stands in sharp contrast to many other law enforcement agencies in the region, according to a review of data compiled from individual departments.

Many observers and police officials attribute Richmond’s relatively low rate of deadly force to reforms initiated under Chief Chris Magnus, who took over a troubled department in this city of 106,000 in 2006. Magnus implemented a variety of programs to reduce the use of lethal force, including special training courses, improved staffing deployments to crisis situations, thorough reviews of all uses of force and equipping officers with nonlethal weapons such as Tasers and pepper spray.

………

More important than luck, said law enforcement expert Tom Nolan, is the culture within a department. If a chief has sent a clear message that instances of deadly force will be scrutinized, you can expect more officers to think twice before firing a weapon, or employ less-lethal means when apprehending a suspect, he said.

“The chief is key in setting policy and tone,” said Nolan, who worked for 27 years as a cop in Boston and now directs graduate programs in criminology at Merrimack College in Massachusetts. “If they haven’t had an officer-involved shooting that’s resulted in death in a city like that, it’s commendable.”

Here is the important bit:

Magnus has done something in Richmond that he believes is not done enough in other departments: He’s been willing to second-guess the deadly force used by other cops.

“We use a case study approach to different incidents that happen in different places. When there is a questionable use-of-force incident somewhere else, we study it and have a lot of dialogue,” Magnus said. “It’s a model that is used in a range of other professions, but in some police circles, it’s seen as judging in hindsight and frowned on. In my mind, that attitude is counterproductive.”

The culture of police tends to mitigate against their examining their own failures.

Instead they circle the wagons, and protect their own, which produces an environment where dysfunction is nurtured, rather than corrected.

H/t Neo at the Stellar Parthenon BBS.