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It is a long-standing principle of English criminal law that a defendant is "innocent until proven guilty". That is, it is the job of the state (technically the Crown) to prove all the facts of the case against the defendant. The presumption of innocence has two facets. First, that the burden of proof falls on the prosecution. It must prove guilt; it is not for the defendant to prove his innocence. Second, the StandardOfProof is 'beyond reasonable doubt'.