The revised guidelines on when and when not to wear masks came as a surprise to many Americans. The Centers for Disease Control and Prevention announced May 13, 2021, that people who are fully vaccinated against COVID-19 can safely enter many indoor settings, such as grocery stores and restaurants, without wearing a mask. The CDC’s updated guidelines also ask that unvaccinated or partially vaccinated people continue to wear a mask – even in establishments like bars and restaurants, where doing so may no longer be required. There is good reason to suspect that at least some unvaccinated Americans may violate the CDC’s recommended “honor system” approach. Although the number of Americans who have been vaccinated or plan to be vaccinated against COVID-19 hasincreased in recent months, many Americans – 34%, according to a recent Kaiser Family Foundation survey – are either on the fence about vaccinating (15%), will vaccinate only if required to do so (6%) or plan to forgo vaccinating altogether (13%).