Nancy O'Malley made headlines recently by charging a cop for a shooting in San Leandro — a first in her tenure — then reopening the investigation into the BART police killing of Oscar Grant. She says she's simply following the law. But as Megan Cassidy reports, O'Malley's decisions come amid the historic Black Lives Matter reform movement that has changed the very nature of being a prosecutor. | Unlimited Chronicle access: sfchronicle.com/pod
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