Once dubbed the 'murder capital' of the world, for nearly three decades, rival gangs ruled the streets of El Salvador through a regime of violence, extortion and fear. That is, until now. For the last year, the country's young, media-savvy president has launched a full-scale war on gangs, imposing emergency constitutional measures and giving police sweeping new powers of arrest. As the State of Exception passes its one-year anniversary, more than 65,000 people have been arrested and dramatic images of a new 'mega prison' hit headlines around the world. But as the country transforms before people's eyes, this newfound freedom hides a dark reality. The government is accused of locking up thousands of innocent people without trial and in flagrant abuse of their human rights. Will Grant meets families impacted by both sides of this controversial policy to uncover the hidden cost of peace on the streets.