LULU GARCIA-NAVARRO, HOST: The Biden administration has pledged to pump $4 billion into Central America to address the root causes that are driving immigrants to the U.S. border, but that's a tall order. NPR's John Burnett visited Honduras recently and examined one struggling program that's trying to lower the homicide rate and convince people to stay. JOHN BURNETT, BYLINE: Rivera Hernandez is one of the most violent neighborhoods in one of the most violent countries in the Americas. It's here that a Christian-based nonprofit with the high-sounding name the Association For A More Just Society, is helping to solve unsolved murders.