retroactively. An example would be imprisoning someone for using some now-illegal drug before said drug was made illegal. This is why “grandfather clauses” exist. You simply cannot apply current laws to past actions — that way lies very capricious tyrannical injustice in the extreme. An example applied to an “Aggregate Person” such as a corporation might include, oh, say, laws requiring existing clinics to comply with new building regulations that would require major reconstruction to comply with. A new clinic may be bound by such laws, but not an already existing one.

Okay, b-but, that’s Congress that’s forbidden from doing those things, right? The States are off the hook and can do those as they please, right? Wrong! Just a bit further down, we have Article I §10 ¶1 which applies the same restrictions (both of the above, among others) to the States!!

And what does the Tenth Amendment say? That all Powers (note: not “Rights” — States don’t have Rights, at all, period! And they never did. Sorry, States Rightsers) not granted by the Constitution to the Federal government, nor forbidden by it to the States, are reserved to the States respectively, or the People.

Article I §10 ¶1 expressly forbids the States from passing Bills of Attainder or Ex Post Facto. The Tenth Amendment is not on the side of the Christianist Christofascist Christocrats on this (or any other) matter.