
Ex post facto laws are a highly controversial topic in the legal world, with some countries prohibiting them while others permit their use. In the United States, the Constitution explicitly forbids ex post facto laws, which are laws that retroactively criminalize actions that were not illegal when committed. This prohibition is outlined in Article 1, Section 9, Clause 3, and Article 1, Section 10, of the U.S. Constitution, ensuring the separation of powers and protecting against legislative overreach. Other countries, like Canada, Australia, and those following the European Convention on Human Rights, have also taken a stand against ex post facto laws, ensuring fair treatment for individuals under the law. However, some nations with parliamentary supremacy or a flexible approach to rights and constitutions may still allow these retroactive laws in certain circumstances. The debate around ex post facto laws revolves around fundamental principles of fairness, legislative power, and the protection of citizens' rights.
| Characteristics | Values |
|---|---|
| What are Ex Post Facto laws? | Laws that retroactively create a crime where none existed before. |
| Are Ex Post Facto laws constitutional? | No, they are prohibited by the United States Constitution, the European Convention on Human Rights, the International Covenant on Civil and Political Rights, and the American Convention on Human Rights. |
| Are there any exceptions? | Some common-law jurisdictions do allow retroactive criminal legislation, and in Europe, ex post facto laws may apply to the extent that they are the milder law. |
| What are examples of Ex Post Facto laws being struck down? | In Cummings, the Court struck down a federal law that targeted and punished a specific group of people without a trial. In California Dep't of Corrections v. Morales, the Court held that an amendment that impacts someone currently imprisoned does not violate ex post facto if it does not increase the punishment. |
| What are Bills of Attainder? | Laws that legislatively determine guilt and inflict punishment on an individual or group without a judicial trial. |
| Are Bills of Attainder constitutional? | No, they are prohibited by the United States Constitution. |
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What You'll Learn

Ex post facto laws and bills of attainder
Ex post facto laws are expressly forbidden by the United States Constitution in Article 1, Section 9, Clause 3 (with respect to federal laws) and Article 1, Section 10 (with respect to state laws). These laws are prohibited because they retroactively create a crime where none existed before, punishing someone for an action that was lawful at the time.
Bills of attainder, on the other hand, are prohibited by the Constitution in Article I, Section 9, Clause 3, which states that "no Bill of Attainder or ex post facto Law shall be passed." A bill of attainder is a law that determines guilt and inflicts punishment upon an individual or group without a judicial trial. In other words, it is a legislative act that applies to named individuals or identifiable groups and inflicts punishment without due process. For example, in United States v. Lovett (1946), the Court struck down a federal law as a bill of attainder because it targeted a specific group of people (those disloyal to the Union) and punished them without a trial.
The prohibitions against ex post facto laws and bills of attainder are fundamental to the American justice system and the Constitution's separation of powers. They ensure that the government cannot punish citizens without due process and prevent legislative overreach by reinforcing the role of the judiciary in determining guilt and innocence.
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Ex post facto laws in the US Constitution
Ex post facto laws are expressly forbidden by the United States Constitution. These laws are viewed as a tool of tyrannical governments, as they allow for the retroactive criminalisation of actions. In other words, ex post facto laws create a crime where none existed before.
The US Constitution prohibits both Congress and state governments from passing ex post facto laws. Article 1, Section 9, Clause 3 of the Constitution states that "no Bill of Attainder or ex post facto Law shall be passed". This clause ensures the separation of powers and preserves the Constitution's separation of powers.
The Supreme Court has defined the scope of ex post facto laws through several restrictions. According to the Court, any statute that punishes an act that was previously legal, increases the burden of punishment for a crime after its commission, or deprives a defendant of a defence that was available at the time of the act is prohibited as ex post facto.
However, it is important to note that the prohibition of ex post facto laws does not apply to judicial decisions in the same way. For example, in the case of California Dep't of Corrections v. Morales, the Supreme Court held that an amendment to a law that changed the parole process for a prisoner did not violate the ex post facto prohibition as long as it did not increase the punishment for the original crime.
In conclusion, ex post facto laws are unconstitutional in the United States as they are expressly forbidden by the US Constitution and interpreted by the Supreme Court. These laws are seen as a legislative overreach and a violation of the separation of powers.
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Ex post facto laws in Europe
Ex post facto laws are expressly forbidden by the United States Constitution. However, the situation is more complex in Europe. While some European countries apply the principle of lex mitior ("the milder law"), which allows for the application of ex post facto laws to a certain extent, others have explicit bans on such laws.
In Europe, the United Kingdom, Lithuania, and Spain are examples of countries that have constitutional provisions prohibiting ex post facto laws. Article 7 of the European Convention on Human Rights, to which the United Kingdom is a signatory, prohibits retrospective criminal laws. However, some legal authorities argue that parliamentary sovereignty takes precedence over this prohibition. Lithuania, as a signatory to the European Convention on Human Rights and a member of the European Union, adheres to the Charter of Fundamental Rights, which has the effect of law. Any retroactive law in Lithuania could be struck down due to these commitments. Article 39 of the Constitution of Japan also prohibits the retroactive application of laws, and Article 2, Part 1 (Chapter 1) of the Criminal Code of the Republic of Lithuania specifically prohibits retroactive criminal sanctions.
Spain provides constitutional guarantees for the principle of non-retroactivity of punitive provisions that are not favorable to or restrictive of individual rights. This means that "ex post facto" criminal laws or any other retroactive punitive provisions are constitutionally prohibited in Spain.
On the other hand, some European countries do not have explicit bans on ex post facto laws and may even apply them in certain situations. For example, Hungary's Constitution, which was in force before 2012, banned ex post facto laws. However, this prohibition was removed from the 'Basic Law', which came into force on January 1, 2012. In 2011, the Hungarian government revised the pension entitlements of police officers and disabled individuals, applying ex post facto laws and divesting them of their acquired rights with retroactive effect.
In summary, the status of ex post facto laws in Europe varies from country to country. While some countries explicitly ban them through their constitutions or international commitments, others may apply them in certain situations or lack strong constitutional prohibitions.
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Ex post facto laws in Australia
Ex post facto laws are expressly forbidden by the United States Constitution in Article 1, Section 9, Clause 3 (with respect to federal laws) and Article 1, Section 10 (with respect to state laws). These constitutional prohibitions prevent the federal and state governments from passing ex post facto laws, which are laws that retroactively create a crime where none existed before.
Australia, however, has no strong constitutional prohibition on ex post facto laws. The early thinking in Australia was that the Commonwealth Constitution's division of powers did not prohibit ex post facto law. While narrowly retrospective laws might violate the constitutional separation of powers principle, Australian courts normally interpret statutes with a strong presumption that they do not apply retrospectively.
The Australian Human Rights Commission states that the Declaration is an "expression of the fundamental values which are shared by all members of the international community", but it "does not directly create legal obligations for countries". Despite this, Australia is a party to the International Covenant on Civil and Political Rights, which expressly prohibits the implementation of retrospective criminal laws. Australia is also a party to the Optional Protocol to the Covenant, which enables individuals to file complaints with the United Nations Human Rights Committee for a state party's non-compliance with the Covenant.
The lack of a strong constitutional prohibition on ex post facto laws in Australia has led to decisions that highlight the tenuous nature of the Australian public's protection against such laws. For example, in one case, the Court sanctioned New South Wales legislation that drastically limited the parole prospects of certain categories of offenders serving life imprisonment. The majority's scant attention to the ex post facto nature of this law underscores the need for a re-examination of the objection to ex post facto laws in Australia.
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Ex post facto laws in Canada
Ex post facto laws are expressly forbidden by the United States Constitution. Article 1, Section 9, Clause 3 prohibits the federal government from enacting ex post facto laws, while Article 1, Section 10 prohibits state governments from doing so. These provisions ensure the separation of powers and prevent legislative overreach.
In Canada, ex post facto criminal laws are constitutionally prohibited by Section 11(g) of the Charter of Rights and Freedoms. This section states that an individual cannot be found guilty of an act that was not an offence under Canadian or international law or considered criminal according to general legal principles at the time of the act. Section 11(i) of the Charter further provides that if the punishment for a crime has changed between the time of the offence and sentencing, the convicted person is entitled to the lesser punishment.
However, it is important to note that the rights guaranteed under Section 11 of the Charter are not absolute and may be overridden due to Section 1 and Section 33 (the notwithstanding clause). While the federal Parliament has never attempted to enact an ex post facto law using Section 33, the possibility exists. Additionally, changes to civil law in Canada can be enacted ex post facto, as they are not subject to Charter restrictions.
The Canadian Supreme Court has interpreted the underlying purpose of Section 11(g) as ensuring that citizens can foresee the consequences of their actions and receive fair notice of what is prohibited. This interpretation aims to limit the state's discretion in penal law matters. While there is limited jurisprudence on Section 11(g), it plays a crucial role in protecting individuals from retroactive criminal offences.
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Frequently asked questions
An ex post facto law is a law that retroactively creates a crime where none existed before.
No, the US Constitution prohibits the federal and state governments from passing ex post facto laws.
During the constitutional convention in 1787, some delegates argued that the Constitution did not need to explicitly prohibit ex post facto laws. However, the Framers ultimately included the prohibition in the Constitution.



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