San Mateo County November 29, 2020 11:04 pm San Mateo County Imposes New Restrictions as It Slides Into Purple Tier San Mateo County rolled back to the most restrictive Purple Tier Sunday, which means there are new restrictions for retail and restaurants. Christie Smith reports. US & World Videos 2:19 San Francisco barbershop struggles to stay open after pandemic 0:51 Alameda County using dogs to detect COVID 3:57 Interview: Doctor's perspective on COVID 4 years after shutdown started 2:27 Marking 4 years since COVID-19 shut down the Bay Area 2:09 CDC updates COVID isolation guidelines