Proof of vaccination requirements could be the key to allowing hard-hit businesses across the U.S. to fully reopen. However, many businesses have been reluctant to demand proof of vaccination from customers, as the public and politicians in many places have made it clear they don't care for the idea.
In fact, far more states have banned proof-of-vaccination policies than have created smartphone-based programs for people to digitally display their vaccination status.
Hawaii is the only state enforcing some version of a vaccine passport, requiring travelers to upload a photo or PDF of their Hawaii vaccination document or pass a pre-arrival COVID-19 test to avoid having to quarantine for 10 days.