LAPD Using Choppers To Prevent Crime:  Data indicates that the use of helicopters to patrol high crime areas of Los Angeles is reducing the number of reported crimes.  Kate Mather and Richard Winton of the Los Angeles Times report that LAPD has been experimenting with helicopter patrols over "hot spots" to deter criminals for a few years.  During one week in 2013 increased helicopter patrols resulted in a 31% drop in reported crimes.  A week later when patrols were reduced, crime shot back up.