Ex Post Facto — related Supreme Court cases
This page groups Supreme Court cases that involve the constitutional concept “Ex Post Facto”. Use it to explore related decisions and see how the same idea shows up across different cases.
“Ex Post Facto” is:
Prohibition on retroactively applying criminal laws to increase punishment.
Source: Article I Where this concept definition/label comes from (for example, a constitutional provision or a reference framework).
Cases
These are cases where this concept was identified as relevant. Click a case to view its summary, holding, and supporting syllabus excerpts.
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Ellingburg v. United States
20th January 2026
The case primarily addresses whether the application of the MVRA to crimes committed before its enactment violates the Ex Post Facto Clause.
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Hewitt v. United States
26th June 2025
The case involves the retroactive application of the First Step Act's more lenient penalties to sentences imposed before the Act's enactment.
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Brown v. United States
23rd May 2024
The case involves whether changes in federal drug schedules can retroactively affect the classification of a state conviction as a 'serious drug offense' under ACCA.
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Concepcion v. United States
27th June 2022
The case involves retroactive application of sentencing laws, which relates to the prohibition on retroactively applying criminal laws to increase punishment.