NO Ex Post Facto Laws

What is it about the phrase "No Ex Post Facto" Laws the ZERO administration does not understand? i.e. You can't make a new law, and have it applied to something that happened in the past.

For instance -- if the law said: "If you speed at 80-100 miles an hour, your maximum fine will be 100 bucks." Then the max fine is 100 bucks. PERIOD. Full Stop. They can't say "Oh, well, that 100 bucks we charged you was too low...you owe us an additional 500 bucks." No even half-assed court in the land would put up with the NEW law applying to things that had happened.

Well, the ZERO administration is hallucinating that they will get BP to pay a lot more for the oil-spill than they are required by law to do so. Good luck with that, Skippy.

Yes, the max penalty for polluting like that WAS too low. Is that BP's fault? Uh, no. It was the US government's fault in the first place for setting the possible max penalty too low. Now you can make a NEW law saying "from X date, THIS will be the penalty..." But it clearly states in the Constitution "NO EX POST FACTO LAWS" (Article 1, section 9)

But then why should I be surprised? It's kind of obvious these people use the Constitution as toilet paper and none of them took high school civics.