The vaccines purportedly last 6 months. It’s not clear how many variants they cover and how well they cover the variants. We don’t know long term risks. The “human ginea pig trials aren’t in yet. This is very short term thinking.
No person shall be held to answer for a capital, or otherwise infamous crime, unless on a presentment or indictment of a Grand Jury, except in cases arising in the land or naval forces, or in the militia, when in actual service in time of war or public danger; nor shall any person be subject for the same offense to be twice put in jeopardy of life or limb; nor shall be compelled in any criminal case to be a witness against himself, nor be deprived of life, liberty, or property, without due process of law; nor shall private property be taken for public use without just compensation.
The freedom to move as you wish, leave your house whenever you want, eat at a restaurant whenever you want, and so much more is included in the word liberty. The only way the federal government can deprive an individual of their liberty is if that individual is found guilty in a court of law by a jury. Vaccine passports are an obscene violation of that clause.
The Due Process Clause of the Fourteenth Amendment of the Federal Constitution prohibits the States from depriving the inhabitants of the States of their liberty unless individuals are tried in a court of law and found guilty by a jury. Vaccine passports would violate that clause of the Constitution. State Constitutions also include clauses that protect the liberty of every individual inhabiting that State. They would be violated by vaccine passports.
In the meantime mRNA fun for all the would be mad scientists.