Los Angeles County Sheriff Alex Villanueva announced that he would not enforce the mandate, which went into effect at 11:59 p.m. Saturday. He cited the Centers for Disease Control and Prevention’s May 13 guidance saying fully vaccinated people no longer need to wear masks. “Forcing the vaccinated and those who already contracted COVID-19 to wear masks indoors is not backed by science and contradicts the U.S. Centers for Disease Control and Prevention (CDC) guidelines,” the sheriff said in a Friday statement. Dr. Murthy said CDC guidelines allow local governments to implement their own mask requirements. “What the CDC did in its guidance, close to two months ago now, is based on the science saying that your risk of getting sick or transmitting the virus was low if you were fully vaccinated,” Dr. Murthy said. “They gave communities and individuals the flexibility to make decisions about what to do with masks.”