The dispute arose from a Connecticut probate proceeding over a decedent's estate. The local probate court had entered a decree adverse to the Bulls' interests, and the time to appeal that decree expired under state law. The Bulls then petitioned the Connecticut General Assembly, which enacted a special legislative resolve authorizing a new hearing in the probate matter despite the lapsed appeal deadline. On rehearing in the state courts, the Bulls prevailed. The adverse party, the Calders, argued that the legislative resolve retroactively changed the legal consequences of past events and therefore constituted an unconstitutional ex post facto law under Article I, Section 10 of the U.S. Constitution. The Connecticut Supreme Court of Errors upheld the legislative resolve and the resulting judgment. The Calders sought review in the U.S. Supreme Court under the Judiciary Act of 1789, asserting that the state's action violated the federal Ex Post Facto Clause.
Does the Ex Post Facto Clause of Article I, Section 10 prohibit a state from enacting retroactive civil legislation, such as a statute or legislative resolve that permits a new hearing in a probate matter after the time to appeal has expired?
The Ex Post Facto Clauses in the U.S. Constitution (Art. I, §§ 9–10) apply only to criminal or penal laws. An ex post facto law is one that, after the commission of an offense: (1) makes an action criminal that was innocent when done and punishes it; (2) aggravates a crime or makes it greater than it was when committed; (3) increases the punishment for a crime beyond what was prescribed when the act was committed; or (4) alters the legal rules of evidence to require less or different evidence than the law required at the time of the offense to secure a conviction. Retroactive civil legislation is not within the Ex Post Facto Clause, though it may be constrained by other constitutional provisions (e.g., Due Process, Takings, Contracts Clause) or state constitutional limits.
No. The Ex Post Facto Clause restricts only criminal or penal laws. Because the Connecticut legislative resolve operated in a civil probate context and did not impose or enhance criminal punishment, it was not an ex post facto law.
The Court grounded its interpretation of the Ex Post Facto Clause in historical usage, constitutional structure, and the Framers' understanding. Justice Chase explained that, at the time of the Constitution's drafting, the term "ex post facto" was a term of art aimed at penal statutes—those that criminalize past conduct, increase punishment, or change evidentiary rules to facilitate conviction. He cataloged four categories of ex post facto laws, all confined to criminal matters. The Connecticut resolve, by contrast, concerned a civil dispute over the administration of an estate and merely authorized a rehearing after a procedural deadline had passed. It neither criminalized past conduct nor increased any punishment and thus fell outside the Ex Post Facto Clause. Justice Paterson concurred, emphasizing that the constitutional text in Article I, Section 10—grouping "ex post facto" alongside bans on bills of attainder and laws impairing the obligation of contracts—reinforces the Clause's penal focus and indicates the Framers used the term in its precise, criminal-law sense. Justice Iredell agreed with the result but stressed a methodological point: courts may invalidate statutes only when they violate written constitutional limits, not merely because they seem unjust or contrary to general principles of natural law. While Justice Chase suggested in dicta that certain extreme acts—such as a law taking property from A and giving it to B—could be void as inconsistent with fundamental principles of the social compact, Iredell warned against judges displacing legislative judgment absent an express constitutional prohibition. Because the resolve at issue neither imposed punishment nor violated another explicit constitutional restriction, the state judgment was affirmed.
Calder v. Bull is the canonical source for the rule that the Ex Post Facto Clauses apply solely to criminal laws. Its four-part definition of ex post facto continues to govern modern jurisprudence, and the case is frequently cited in decisions assessing retroactive criminal statutes (e.g., Collins v. Youngblood; Carmell v. Texas; Stogner v. California). For students, Calder also illuminates early debates about judicial review: Justice Chase's natural law-inflected dicta versus Justice Iredell's positivist insistence on written constitutional limits. That debate foreshadows later understandings of the judicial role and shapes how courts analyze retroactive civil legislation today—usually under due process, takings, or the Contracts Clause, rather than the Ex Post Facto Clause.
Calder v. Bull set the enduring boundaries of the Ex Post Facto Clauses by anchoring them to the criminal law. The Court's historically grounded definition protects against retroactive punishment while leaving retroactive civil legislation to be measured by other constitutional safeguards. This precision prevents the Clause from becoming a generalized ban on all retroactivity and preserves legislative flexibility in civil matters.