In Rio de Janeiro, over many days, the director Maria Ramos witnesses and films the judgment of several teenagers accused of stealing, trafficking and murdering. Underage youths are protected by the Brazilian laws and their faces can not be exposed; therefore, they are replaced by teenagers from poor communities.

For decades, the United States has been fixated on incarceration, building prisons and locking up more and more people. But at what cost, and has it really made a difference? FRONTLINE goes to the epicenter of the raging debate about incarceration in America, focusing on the controversial practice of solitary confinement and on new efforts to reduce the prison population, as officials are rethinking what to do with criminals.