Latin America is grappling with a surge in homicides that has made it the world’s most murderous region. Amid the carnage, however, there are hints of solutions and experiments from across the region, which are aimed at bringing the crisis under control. New law-enforcement standards, data-driven policing tools and social programs are slowing the violence and, in some cases, dramatically reducing homicide rates…

Cali, Colombia, once the home of an infamous drug cartel that bore its name, is expected to end 2018 with about 1,154 homicides, compared with 1,959 in 2013—a 41% drop. The 2018 homicide rate is expected to be 47 per 100,000, still high but improved from 84.5 per 100,000 of five years ago.

The most tantalizing of Cali’s anticrime strategies is identifying some of the city’s dangerous young men for personal supervision by case workers who oversee schooling, therapy, sports programs, training and job placement.