Former Bogota Security Secretary Hugo Acero speaks in Rio de Janeiro, Brazil, April 25, 2008 before the presentation of a film on combating violence. Acero, a sociologist, helped reduced crime rates in Bogota drastically during his time as security secretary and the measures are being studied in Rio to combat crime there.(Australfoto/Douglas Engle)

Former Bogota Security Secretary Hugo Acero speaks in Rio de Janeiro, Brazil, April 25, 2008 before the presentation of a film on combating violence. Acero, a sociologist, helped reduced crime rates in Bogota drastically during his time as security secretary and the measures are being studied in Rio to combat crime there.(Australfoto/Douglas Engle)