Honor system, paper cards won't cut it for COVID-19 vaccine verification, experts say. 'Vaccine passports' are coming.

No shirt, no shoes, no vaccine – no service.

That's the future critics of "vaccine passports" fear as Americans vaccinated against COVID-19 can safely live more normal lives, including spending time in most indoor settings without a mask.

The notion that a "passport" could separate the vaccinated from the unvaccinated has sparked fears of a dystopian future where people's health decisions would limit where they could travel, where they could shop, what events they could attend and whether they would be asked to wear a mask.

Many states have taken a stand against that possibility. 

Alaska, Arizona, Florida, Idaho, Montana, South Dakota, Texas and Wyoming have all moved to restrict the use of "vaccine passports." Even more states have signaled they're not interested in launching any such program.