With Los Angeles County’s new COVID-19 vaccine proof requirements now in effect for bars and other venues, bartenders are faced with turning away paying customers and worrying about having to deal with unruly patrons. The venues will have to make sure that customers aged 12 and older have taken two doses of the Pfizer or Moderna vaccines, or one dose of Johnson & Johnson at least 14 days before trying to enter the venue. But critics have voiced concern over the differing rules in the city and county sowing confusion for businesses and customers, and putting those in L.A. at...