
Ex post facto laws are those that retroactively punish actions that were not illegal when committed. The term is derived from Latin, meaning from a thing done afterward. While the prohibition of ex post facto laws is a feature of many countries' legal systems, the specific application varies. For example, in the US, two clauses in the Constitution prohibit ex post facto laws, while in Canada, ex post facto criminal laws are constitutionally prohibited by the Charter of Rights and Freedoms. However, changes to civil law in Canada can be enacted ex post facto. In Italy, Article 25, paragraph 2, of the Italian Constitution prohibits indictment pursuant to a retroactive law. In Brazil, the constitution prohibits ex post facto laws from affecting acquired rights, accomplished juridical acts, and res judicata.
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What You'll Learn

Ex post facto laws are prohibited by the US Constitution
The Ex Post Facto Clause also prohibits the application of new laws with higher penalties to past actions. However, it does not prohibit the application of new laws with lower penalties to past actions. This distinction is important as it allows for some flexibility in the legal system while still protecting individuals from unfair retroactive punishment.
The US Constitution also includes a similar prohibition against bills of attainder, which are laws that determine guilt and impose punishment on specific individuals or groups without a judicial trial. Both of these prohibitions work together to protect against legislative overreach and preserve the separation of powers.
The prohibition of ex post facto laws by the US Constitution has been a topic of discussion and debate throughout history. During the constitutional convention in 1787, some delegates argued that the Constitution did not need to explicitly prohibit ex post facto laws, as it was evident that imposing criminal punishment for past innocent actions was improper. However, others believed that including the prohibition was necessary to uphold the principles of sound legislation.
The Supreme Court has played a significant role in interpreting and applying the Ex Post Facto Clause. In cases such as Calder v. Bull, the Court has outlined specific categories of ex post facto laws, including laws that inflict punishment where none was previously applicable or laws that increase punishment beyond what was authorized at the time of the crime. The Court has also denied ex post facto claims when it found that a law was not ex post facto as applied to the specific challenger, even if it might be for others.
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Ex post facto laws can be overridden in Canada
In Canada, ex post facto laws are prohibited by Section 11(g) of the Charter of Rights and Freedoms. This section states that no person should be found guilty of any act that was not an offence under Canadian or international law or was not criminal according to the general principles of law recognized by the community of nations, at the time of the act.
However, despite the prohibition, ex post facto laws can be overridden in Canada. Section 11 of the Charter, which includes Section 11(g), is among the sections that can be overridden under Section 33 (the notwithstanding clause). This means that, in theory, Parliament could enact ex post facto laws by invoking Section 33. Nevertheless, it is important to note that the federal Parliament, which holds exclusive jurisdiction over criminal law, has never attempted to enact an ex post facto law using this clause. The Charter prohibition solely applies to criminal law, and any changes or enactments to civil law in Canada are not subject to the same restrictions.
An example of an ex post facto law in Canada is the sex offender registry, which came into effect on December 15, 2004. When the national registry was created, all offenders who were previously on the Ontario sex offender registry, established in 2001, were required to register on the new national registry. This demonstrates the retroactive nature of the law, as it applied to offenders before the law was enacted.
Ex post facto laws are most commonly associated with criminal law, where they can criminalize actions that were previously legal, aggravate a crime by assigning it to a more severe category, change prescribed punishments, extend the statute of limitations, or alter rules of evidence to increase the likelihood of conviction. Conversely, amnesty laws, a form of ex post facto legislation, can decriminalize certain acts, prohibit prosecution, or remove punishments while leaving the underlying conviction technically unaltered.
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Ex post facto laws can be applied retrospectively within certain limits in France
Ex post facto laws are a form of retrospective or retroactive law—that is, a law that is applied to events that occurred before its enactment. In a legal context, ex post facto laws are used to refer to criminal statutes that punish actions retroactively, thereby criminalising conduct that was legal when it was originally performed.
In France, ex post facto laws, or "lois rétroactives" (retroactive laws), are technically prohibited by Article 2 of the Code Civil, which states: "Legislation provides only for the future; it has no retrospective operation". However, the Code Civil does not have the status of constitutional legislation and can be overruled by subsequent laws. The Conseil Constitutionnel has determined that retroactive laws can be passed within certain limits.
For example, in criminal law, ex post facto sanctions are effectively forbidden as per Article 112-1 of the French Penal Code, except in cases where the retroactive application benefits the accused person (called retroactivity in mitius). This is also considered unconstitutional, as the principle of non-retroactivity is laid down in Article 8 of the Declaration of the Rights of Man and of the Citizen, which has constitutional status under French law.
The épuration légale trials held after the 1944 liberation of France introduced the status of indignité nationale for Nazi collaborators as a way to avoid ex post facto law. This is an example of how ex post facto laws can be applied retrospectively within certain limits in France.
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Ex post facto laws are prohibited in Italy and Japan
In Italy, Article 25, paragraph 2, of the Italian Constitution states that "nobody can be punished but according to a law come into force before the deed was committed." This prohibits indictment pursuant to a retroactive law. Additionally, Article 11 of the preliminary provisions of the Italian Civil Code and Article 3, paragraph 1, of the Statute of Taxpayer's Rights, prohibit retroactive laws on principle.
Japan also prohibits ex post facto laws through Article 39 of its Constitution, which states that criminal penalties can only be imposed according to the procedure established by law at the time of the deed. This is further reinforced by Article 6 of the Criminal Code of Japan, which mandates that if a new law comes into force after the deed, the lighter punishment must be applied.
The prohibition of ex post facto laws is a significant aspect of legal systems worldwide. In the United States, for example, the Constitution expressly forbids ex post facto laws in Article 1, Section 9, Clause 3, for federal laws, and in Article 1, Section 10, for state laws. Similarly, in Canada, ex post facto criminal laws are constitutionally prohibited by Section 11(g) of the Charter of Rights and Freedoms, which also ensures that individuals receive the lesser punishment if the penalty for a crime changes between the time of the offense and sentencing.
Some nations, like those following the Westminster system of government, may allow ex post facto laws due to the doctrine of parliamentary supremacy. However, in countries with a written constitution or an entrenched bill of rights, ex post facto legislation is typically prohibited or allowed based on specific provisions. For instance, France technically prohibits retroactive laws through Article 2 of the Code Civil, although it allows for exceptions when retroactive criminal laws benefit the accused.
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Ex post facto laws are not prohibited in Lithuania
Ex post facto laws are those that criminalise actions retroactively, thereby punishing actions that were legal when they were performed. In the US, ex post facto laws are prohibited by the Constitution, which forbids Congress and the states from passing any such laws. This prohibition is also present in the constitutions of several other countries, including Italy, Japan, Brazil, Canada, and France.
However, Lithuania has no constitutional prohibition on ex post facto laws. This means that, in theory, such laws could be enacted in Lithuania. Nevertheless, as a signatory to the European Convention on Human Rights and a member of the European Union, Lithuania is still bound by certain restrictions on ex post facto laws. For example, Article 2, Part 1 (Chapter 1) of the Criminal Code of the Republic of Lithuania prohibits retroactive criminal sanctions, while Article 8 of the Administrative Code of the Republic of Lithuania prohibits retroactive administrative sanctions.
The absence of a constitutional prohibition on ex post facto laws in Lithuania may be due to the country's legal system and history. Lithuania follows the civil law tradition, which, unlike common law systems, does not generally require judicial decisions to follow previous rulings or interpretations. This may provide more flexibility in the application of ex post facto laws, as judges are not bound by precedent to the same extent as in common law systems.
Furthermore, Lithuania has experienced periods of political and legal transition, such as the period following the Soviet occupation, during which the application of ex post facto laws may have been complex and subject to varying interpretations. The European Convention on Human Rights, which Lithuania has signed, also prohibits ex post facto criminalization, providing an additional layer of protection against such laws.
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Frequently asked questions
Ex post facto laws refer to laws that retroactively punish conduct that was legal when originally performed. The term is derived from Latin, meaning "from a thing done afterward".
After the Finnish Civil War of 1918, the Parliament of Finland passed a law setting up tribunals to try suspected rebels. These tribunals issued death sentences in many cases, although very few of those accused could have committed a crime that carried the death penalty under Finnish law at the time.
Two clauses in the United States Constitution prohibit ex post facto laws: Article 1, Section 9 prohibits Congress from passing ex post facto laws, and Article 1, Section 10 prohibits states from passing such laws.







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