| The case dealt with the Article I, Section 10, prohibition on ex post facto laws, because it concerned a Connecticut state law. |
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| Coupled with the Constitution's proscription of ex post facto laws is a similar prohibition against bills of attainder. |
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| Generally, the Finnish legal system does not permit ex post facto laws, especially those that would expand criminal responsibility. |
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| In civil matters, such as taxation, ex post facto laws may be made in some circumstances. |
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| In the United Kingdom, ex post facto laws are frowned upon, but are permitted by virtue of the doctrine of parliamentary sovereignty. |
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| In England Parliament is not prohibited from passing ex post facto laws. |
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| Australia has no strong constitutional prohibition on ex post facto laws, although narrowly retroactive laws might violate the constitutional separation of powers principle. |
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| In the United States, Congress is prohibited from passing ex post facto laws by clause 3 of Article I, Section 9 of the United States Constitution. |
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| Constitution, which prohibited ex post facto laws at both the federal and state level, the question was raised whether there could be common law crimes in the United States. |
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