When Dr Rodrigo Guerrero was mayor of Cali in Colombia in 1992, he approached violence in the same way as a disease. Now, many cities use similar violence reduction methods. Show more
Discover 11,128,835 listings and 279,536 playable programmes from the BBC
When Dr Rodrigo Guerrero was mayor of Cali in Colombia in 1992, he approached violence in the same way as a disease. Now, many cities use similar violence reduction methods. Show more