States Can’t Make Up New Laws to Punish Old Conduct Just Because They Call Them “Civil”

Article I, Section 10 of the Constitution provides that “[n]o State shall … pass any … Ex Post Facto law.” The Ex Post Facto Clause was incorporated into the Constitution to prohibit states from enacting retrospective legislation, which the Framers believed to be inherently unfair and contrary to the principles of limited, constitutional government. Despite the Framers’ clear aversion to retrospective lawmaking, the Supreme Court has since adopted the view that states are uninhibited from enacting retroactive civil penalties. So long as a retrospective law contains a discernable legislative purpose…

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