A short NYT article reviews the situation, with a focus on Kansas City, but these two paragraphs struck me - is this option really working?

The Memphis police force, a pioneer in predictive policing, has worked with the University of Memphis for about a decade to forecast crime by noting time and location of episodes and information about victims. Officers then flood those areas with marked and undercover police cars, and also increase traffic stops, the department said.

But violent crime has proved stubborn in Memphis, and the city continues to be one of the most dangerous places in the nation, according to F.B.I. data.
Link:http://www.nytimes.com/2015/09/25/us...t-crimes.html?