New CDC guidelines set off rush to reimpose mask mandates New guidance from the federal government set off a cascade of mask rules across the nation Wednesday. Joann Marcus of Fort Lauderdale, left, cheers as she listens to the Broward School Board's emergency meeting, Wednesday, July 28, 2021, in Fort Lauderdale, Fla. (AP Photo/Marta Lavandier) (AP) — New guidance from the federal government set off a cascade of mask rules across the nation Wednesday as cities, states, schools and businesses raced to restore mandates and others pushed back against the guidelines at a time when Americans are exhausted and confused over constantly shifting pandemic measures.