Confusion Reigns After US Lifts Mask Guidance

President Joe Biden hailed the change in guidance by the Centers for Disease Control and Prevention, calling it a "great day" for America.

To mask or not to mask? That is the question facing US states, businesses and people in their everyday lives in the wake of the bombshell announcement by the top health authority lifting most restrictions for those fully vaccinated against Covid-19. President Joe Biden hailed the change in guidance by the Centers for Disease Control and Prevention, calling it a "great day" for America. But if the idea sounded straightforward in theory, it has raised questions about how to implement it practically -- the foremost being, how do you tell if a person is fully vaccinated?