Will vaccine passports fizzle like contact-tracing apps?

The potential widespread adoption of digital passes for the vaccinated is provoking excitement and consternation in equal measure. But there’s a good chance the effort peters out before it can have an impact.

In this undated photo provided by the New York governor's press office on March 27 is the new "Excelsior Pass" app, a digital pass that people can download to show proof of vaccination or a negative COVID-19 test. (New York Governor's Press Office via AP, File)