'Predictive tools can now track how a single shooting incident triggers a lethal cascade of gunshot violence—and predict who will be targeted next. Much gun violence in American cities follows this tit-for-tat pattern of vendetta between people who know each other. What if there was a way to anticipate that and break the chain? A new study says it’s possible to do just that Using police records of people arrested together for the same offense, researchers mapped a network of 138,163 subjects and looked at the spread of violence within it. When they ran probabilities on people linked to a shooting victim, what they found was staggering: 63 percent of the 11,123 total shootings in the network were part of a longer chain of gunshot victimization. The closer someone was to a victim, the greater the risk of being shot...'