Can police be taught to stop their own violence? Bostonâs department and others are adopting a peer-intervention training program. The ideas come from a UMass psychologist who survived the Holocaust, thanks to the help of others. By Douglas StarrUpdated May 6, 2021, 7:31 a.m. Email to a Friend Ervin Staub, a professor emeritus at UMass Amherst, is an expert on the science of interventionzack wittman for the boston globe THE KILLING OF George Floyd is a recurring national nightmare. It played out again during the trial of his murderer, former Minneapolis police officer Derek Chauvin âÂ...