Gustavo Petro called on the US and other developed nations to change drug policies that prohibited cocaine and fed violent conflicts across Colombia.The former member of Colombia's M-19 guerrilla group, promised to fight inequality and bring peace to a country long-haunted by bloody feuds between the government, drug traffickers and rebels as he was sworn in on Sunday.

Gustavo Petro called on the US and other developed nations to change drug policies that prohibited cocaine and fed violent conflicts across Colombia.The former member of Colombia's M-19 guerrilla group, promised to fight inequality and bring peace to a country long-haunted by bloody feuds between the government, drug traffickers and rebels as he was sworn in on Sunday.