Brazil: Getting tough with Rio's violent drug gangs

Rio de Janeiro's hillside favelas, or poor neighborhoods, have been controlled by violent drug gangs for decades. As the city prepares to host the 2014 World Cup and 2016 Summer Olympics, officials are launching a program to expel the gangs and improve conditions for the poor. In his first of a two part series on Rio's favela pacification program, our correspondent takes a look at the Police Pacification Units assigned to the task.