/bæn ɒn ɛks poʊst ˈfæktoʊ ˌlɛdʒɪsˈleɪʃən/ – Phrase
Definition: nguyên tắc cấm hồi tố của luật pháp.
A more thorough explanation: A ban on ex-post facto legislation refers to a legal principle that prohibits the enactment of laws that retroactively criminalize conduct that was not illegal at the time it occurred. This principle ensures that individuals are not punished for actions that were lawful when they were committed.
Example: The constitution includes a ban on ex-post facto legislation, which prohibits the government from passing laws that retroactively criminalize conduct that was legal when it occurred.