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Six years ago this August, Michael Brown, a black 18-year-old who had just graduated from high school, was shot and killed by a police officer in Ferguson, Mo. His death, along with those of so many others, set off a national debate about how to reduce police violence. But the deaths of George Floyd in Minneapolis this week and of Breonna Taylor in March are a painful reminder of just how little has changed:
Why has there been so little progress, and what needs to happen for these…