Larry Sherman is a criminologist who teamed up with David Weisburd to study crime in Minneapolis. Sherman and Weisburd discovered that crime was confined to roughly 3.3 percent of the city’s streets. These findings led them to develop the Law of Crime Concentration, which suggests that “crime is tied to very specific places and contexts.” Sherman is also responsible for his experiments with the Kansas City Police Department in the 1990s. Sherman successfully implemented preventative patrol techniques to reduce Kansas City’s major gun problem in the 1990s, when Kansas City’s crime rate was roughly three times the national average. The success of Lawrence’s experiment rested on his emphasis on focused policing, only increasing patrolling in areas with heavy crime rates.