Across the US, many hard-hit businesses eager to return to normal have been reluctant to demand proof of vaccination from customers. And the public and the 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 programmes for people to digitally display their vaccination status.

The Centres for Disease Control and Prevention still recommends masks when dining or gathering indoors for those who aren’t fully vaccinated. But few states require it, and most businesses rely on voluntary compliance — even in places with low vaccination rates where Covid-19 cases are climbing.

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