White police officers in Chicago are far more likely than their Black counterparts to stop, arrest or use force against Black civilians … according to a study published Thursday in Science. … It is unclear how the results of the new research apply to other cities, given Chicago’s long history of tensions between civilians and the police. But study co-author Bocar Ba, an economist at the University of California, Irvine, says the research still provides a template for evaluating reform efforts. “What is needed is more data transparency, access to institutional details, and researchers from all across the board,” Ba adds.
 
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