cessante ratione legis, cessat lex ipsa

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[Latin: when the reason for a law ceases, the law itself ceases]

The principle that when the grounds that gave rise to a law cease to exist, the law itself ceases to exist. A good example of this can be found with regard to the immunity of advocates as discussed by Lord Hoffmann in Arthur J S Hall & Co v Simons [2002] 1 AC 615 (HL).

Subjects: Law.

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