Abstract

Common lawyers are accustomed to the presumption of innocence being described as a “golden thread” running “[t]hroughout the web” of the criminal law: “that it is the duty of the prosecution to prove the prisoner’s guilt” (Woolmington v DPP [1935] AC 462 per Viscount Sankey LC at 481). But although the language of “golden thread” is memorable and oft-quoted, the presumption of innocence must mean more than this: it is not simply a restatement of the burden of proof in a criminal trial.Once this simple point is recognised, a whole host of more complex questions arise. For example: what, precisely, is the scope of the principle? Is this a matter on which consensus is possible or desirable? What role does the presumption have to play in pre-trial proceedings, in decisions by prosecutors? Does the presumption have consequences for the substantive criminal law, or can legislators blunt its impact by defining criminal offences so as to deprive the presumption of its bite? Can legislators tr