Two deaths by police. Zero charges. San Francisco District Attorney George Gascón said Thursday that his hands are tied and he won't be prosecuting the officers who killed two men of color in high-profile cases. But he calls the shootings of Mario Woods in 2015 and Luis Gongora in 2016 “unnecessary” and “disturbing.” So why can’t he prosecute?

Guest: Alex Emslie, KQED criminal justice reporter

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