Report: New York's pilot program vaccine passports are easy to fake-
[thefederalist.com]
Attorney and privacy advocate Albert Fox Cahn, executive director of the Surveillance Technology Oversight Project, took only 11 minutes to obtain someone else’s vaccine passport in New York, according to the Washington Post.
"fake passport" notwithstanding the illegal part is in the act where someone authoritatively demands you show your "passport" / "ID" as you go about your business day to day.
If you have committed a crime or if there is "reasonable suspicion" that you committed a crime then a LEO may demand to see your ID.