Now, two states have banned them calling it an overreach.
Gil Soffer, ABC 7 legal analyst, breaks down legal questions around vaccine passports.
SEE ALSO: What is a vaccine passport and how would it be used?
The White House has said the federal government will not mandate vaccine passports, but could Governor JB Pritzker implement a requirement? Soffer said Pritzker probably could because of a 1905 Supreme Court case.
Soffer said businesses can require vaccinations, but they have to make accommodations for people with sincerely held religious beliefs or medical reasons.