I was not surprised knowing that meditation helps to reduce the crime rates. I found an official study done in Washington DC many years back, which can found here - http://www.istpp.org/crime_prevention/
Based on this study, the steady state gain (long-term effect) associated with a permanent group of 4,000 participants in the Transcendental Meditation and TM-Sidhi programs was calculated as a 48% reduction in HRA crimes in the District of Columbia.
This was also mentioned in the movie "What the Bleep - Down the rabbit hole" where they mentioned that the Washington D.C police department made fun of the projected crime rate saying that D.C will never have that type of crime reduction unless there was two feet snow in that time (June-July 93). But then they were very surprised when they saw the actual results!
It is bit unfortunate that Governments don't fund the meditation programs even after proofs like these.