Proof of vaccination will be required starting Aug. 20 at many businesses in San Francisco, including restaurants, bars, gyms and some of the biggest event venues. The city decided to put in one of the nation's toughest mandates, both to keep people safer from COVID-19 and to push holdouts to get their shots. Trisha Thadani talks to host Demian Bulwa about how the new rules work, and Janelle Bitker takes you behind the scenes at Bay Area restaurants that have been demanding proof of vaccination for several weeks. | Unlimited Chronicle access: sfchronicle.com/pod

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