Cristina Alonso is with the Harvard T. H. Chan School of Public Health, Boston, MA; La Colaborativa, Chelsea, MA; and the Center of Complex Interventions, Wellesley, MA. Barry Keppard is with the Metropolitan Area Planning Council, Boston. Samantha Bates is with the Center of Complex Interventions, Boston. Dan Cortez is with the Chelsea Police Department, Chelsea. Flor Amaya is with the Chelsea Department of Public Health, Chelsea. Karthik Dinakar is with Brigham and Women’s Hospital, Boston;...