The city of Bogota has seen a significant reduction in homicides after passing a ban on carrying guns. If the two developments prove to be related, the ban could provide a model to other violence-plagued cities in the region. On February 1, newly-elected Bogota mayor Gustavo Petro introduced a three-month ban on carrying guns in public, saying that to carry a weapon represented "not a defense mechanism, but a risk." On April 30, Petro declared that the ban had been a... (GunPolicy.org)