The New York Times reports that crime in the U.S. continues an overall downward trend, but a few cities experienced an increase in homicides in 2015. Dr. Berk explains the way crime rates change year-to-year and neighborhood by neighborhood. He said, "It isn't a national trend, it's a city trend, and it's not even a city trend, but a problem in certain neighborhoods." For more on his thoughts about the 2015 homicide rate, click here.