A strategy that puts teams of cops on a beat, an age-old crime-fighting tactic that Commissioner Edward F. Davis revived in Boston more than four years ago, has helped reduce the number of shootings and robberies, according to a federally funded study commissioned by the Boston Police Department. The hot spots patrolled by the teams experienced a 17 percent drop in overall violent crime since the strategy was launched, compared with 2000-2006, when the teams were not in place.
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