Study shows that Meditation Reduced crime in Washington DC.

Group Practice of the Meditation Program & Preventing Violent Crime in Washington, DC:

Results of the National Demonstration Project, June-July 1993

This is a 2 month study to reduce violent crime in Washington DC. They brought 4,000 participants to meditate and the results were measured by the police department and the DC government.  The experiment lasted from June 7 to July 30, 1993.  See Study online.