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As well as having its ordinary meaning, 'an information' is a document laid before a justice (usually a Magistrate) with a view to beginning criminal proceedings. In theory, an information may be laid by anybody but, in practice, this action will be taken by the police (technically by the Chief Constable or his representative). If the information is sound, the magistrate will issue a Summons or, in certain cases, an Arrest warrant. Techically, an information is laid under oath.