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De facto and de jure

Latin expressions meaning 'from fact' and 'from law'

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Jurisprudence

In jurisprudence, a de facto law (also known as a de facto regulation) is a law or regulation that is followed but "is not specifically enumerated by a law." By definition, de facto 'contrasts' de jure which means "as defined by law" or "as a matter of law." For example, if a particular law exists in one jurisdiction, but is followed in another where it has no legal effect (such as in another country), then the law could be considered a de facto regulation (a "de facto regulation" is not an officially prescribed legal classification for a type of law in a particular jurisdiction, rather, it is a concept about law(s).

A de facto regulation may be followed by an organization as a result of the market size of the jurisdiction imposing the regulation as a proportion of the overall market; wherein the market share is so large that it results in the organization choosing to comply by implementing one standard of business with respect to the given de facto law instead of altering standards between different jurisdictions and markets (e.g. data protection, manufacturing, etc.).

In prison sentences, the term de facto life sentence (also known as a "virtual" life sentence) is used to describe a "non-life sentence" that is long enough to end after the convicted person would have likely died due to old age, or one long enough to cause the convicted person to "live out the vast majority of their life in jail prior to their release."

In U.S. law, particularly after Brown v. Board of Education (1954), the difference between de facto segregation (that existed because of voluntary associations and neighborhoods) and de jure segregation (that existed because of local laws) became important distinctions for court-mandated remedial purposes.

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