As the number of COVID-19 vaccinations grows, some states are looking at their vaccination rates to determine when to loosen measures that mitigate the spread of COVID-19, such as venue capacity limits, business closure times, and masking requirements. As vaccinations allow businesses to reopen and customers to return, questions have arisen about whether venues or services—especially those that bring people in close contact for long periods of times—such as retail stores, concert venues, entertainment venues, air travel, cruise ships, etc., can require patrons or customers to verify that they received a COVID-19 vaccine. So far, state policy makers have had mixed views on the issue.