Also known as:ex post facto law · ex-post-facto law · ex-post-facto laws · ex post facto · ex-post-facto
Written by attorneys — see sources below.
A constitutional prohibition that bars the federal government and the states from enacting legislation making conduct criminal that was lawful when performed, increasing the punishment for a completed offense, or altering rules of evidence to make conviction easier.
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How its tested
Common Examples
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State Rent Hike Felony
Evelyn Ellison raised rents on her apartment buildings four years before any statute addressed the practice. After Franklin enacted a new felony for prior rent increases above a threshold, prosecutors charged her using old lease records. The court dismissed the charges because the statute retroactively criminalized conduct lawful when performed.
Revived Prosecution Attempt
Eileen Epstein completed a financial transaction that became time-barred under the original statute of limitations. A later statute extended the period and prosecutors sought to charge her for the old conduct. The court rejected the indictment because the extension reopened punishment for completed acts after the bar had run.
Eduardo Enriquez acquired cultural artifacts decades earlier under rules then in force. Congress later made such past acquisitions a federal crime and prosecutors indicted him. The court dismissed the charges because the statute retroactively attached criminal liability to lawful prior conduct.
Retroactive Sentencing Increase
Emma Erickson was convicted of trafficking under penalties in effect at the time of her offense. A new statute raised mandatory minimums and directed their application to all prior offenses. The sentencing court refused to impose the higher terms because they would increase punishment for completed conduct.
Dred Scott v. Sandford60 U.S. (19 How.) 393
Dred Scott, along with his wife Harriet and their two children Eliza and Lizzie, was held as a slave by the defendant John F. A. Sandford in the State of Missouri. Scott initiated an action in the Circuit Court of the United States for the District of Missouri asserting his and his family's right to freedom. The declaration averred that Scott was a citizen of Missouri and the defendant a citizen of New York to establish diversity jurisdiction.
The defendant responded with a plea in abatement asserting that the court lacked jurisdiction because Scott was not a citizen of Missouri. Scott was a negro of African descent whose ancestors were of pure African blood and had been brought into the country and sold as slaves. Scott demurred to this plea. The Circuit Court overruled the plea and required the defendant to answer over. The defendant then filed pleas in bar. After a trial on the merits the jury returned a verdict in favor of the defendant, leading to judgment for him. Scott then prosecuted a writ of error to the Supreme Court.
The underlying facts showed that Scott had been the slave of Dr. Emerson, a surgeon in the United States Army. In 1834 Emerson took Scott from Missouri to Rock Island in Illinois, where he held him as a slave until 1836. Emerson then removed Scott to Fort Snelling in the Territory of Upper Louisiana north of thirty-six degrees thirty minutes north latitude, holding him there until 1838. Harriet, originally the slave of Major Taliaferro, was also brought to Fort Snelling and sold to Emerson. Scott and Harriet were married at Fort Snelling in 1836 with Emerson's consent, and their children were born there or during the return journey. In 1838 Emerson brought the family back to Missouri, where they resided until Emerson sold them to Sandford.
The case reached the Supreme Court after two arguments. The Court ordered reargument on some of the points due to differences of opinion among the justices and the importance of the questions involved.
Enzo Eastwood completed his offense before a sex-offender registration statute took effect. Officials sought to impose the registration and notification requirements on him. The court upheld the measure because it was civil and regulatory rather than punitive in purpose and effect.
Eldred v. Ashcroft537 U.S. 186
In 1998 Congress enacted the Copyright Term Extension Act, which extended the duration of all federal copyrights by twenty years. For works created by identified natural persons the new term runs from creation until seventy years after the author's death. For anonymous works, pseudonymous works, and works made for hire the term is ninety-five years from publication or one hundred twenty years from creation, whichever expires first. The statute applied these extended terms both to copyrights already in existence and to works created after its effective date.
Petitioners are individuals and businesses whose products or services build on copyrighted works that have gone into the public domain. They filed suit in the United States District Court for the District of Columbia seeking a declaration that the extension of existing copyrights exceeded Congress's power under the Copyright Clause and violated the First Amendment. On cross-motions for judgment on the pleadings the district court entered judgment for the Attorney General.
The Court of Appeals for the District of Columbia Circuit affirmed. A majority of the panel upheld the statute against both challenges, while Judge Sentelle dissented in part on the Copyright Clause issue. The Supreme Court granted certiorari to address whether the extension of existing copyrights exceeds Congress's power under the Copyright Clause and whether the extension violates the First Amendment.
Ethan Evans committed his crime under a prior capital sentencing scheme later invalidated. A new statute replaced it with procedures that did not increase the likelihood of death. The court applied the new procedures because they altered only process without raising the quantum of punishment.
Miller v. California413 U.S. 15, 30-34 (1973)
The appellant conducted a mass mailing campaign advertising the sale of illustrated books and a film described as adult material. After a jury trial he was convicted under California Penal Code § 311.2(a) for knowingly distributing obscene matter based on the mailing of five unsolicited advertising brochures to a Newport Beach restaurant. The brochures contained explicit pictures and drawings depicting sexual activity and genitals.
This case was tried on the theory that California's obscenity statute incorporated the tripartite Memoirs test and the jury was instructed to apply contemporary community standards of the State of California. Both parties at trial assumed the community standards were those of the State of California; defense counsel did not object to the state's expert testimony on community standards or to the judge's instruction. Appellant raised for the first time on appeal the contention that application of state rather than national standards violated the First and Fourteenth Amendments.
The judgment of the Appellate Department of the Superior Court, Orange County, California, came before the Supreme Court of the United States for review as part of a group of obscenity cases in which the Court re-examined the standards for identifying obscene material that may be regulated by the States.
What conduct does the Ex Post Facto Clause forbid?
The clause prohibits legislation that retroactively makes conduct criminal which was lawful when performed, increases punishment for a completed offense, or changes rules of evidence to the defendant's disadvantage.
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Does the clause apply to both Congress and the states?
Yes. Article I Section 9 bars Congress and Article I Section 10 bars the states from passing ex post facto laws.
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May a statute reviving a time-barred prosecution violate the clause?
Yes. Extending a statute of limitations after it has expired and applying it to past conduct violates the clause by retroactively altering the quantum of evidence needed for conviction.
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Does the clause bar retroactive increases in criminal penalties?
Yes. A statute that raises maximum or mandatory minimum sentences and applies them to offenses committed before its enactment increases punishment for past conduct and is invalid.
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Are civil regulatory measures subject to the clause?
Only if they are so punitive in purpose or effect that they function as criminal punishment. Otherwise civil registration or notification schemes may apply to prior offenses.
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Does the clause apply to judicial decisions?
No, but due process forbids courts from retroactively interpreting criminal law in an unexpected and indefensible way that disadvantages defendants.
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424 U.S. 1 (1976)
…a measure was "necessary and proper" to the discharge of its substantive legislative authority, pass a bill of attainder or ex post facto law contrary to the prohibitions contained in § 9 of Art. I. No more may it vest in itself, or in its officers, the authority to appoint officers of the United States when the Appointments…