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William Garrow (1760–1840) was a British barrister, politician and judge known for his indirect reform of the advocacy system, which helped usher in the adversarial court system used in most common law nations today. He introduced the phrase "innocent until proven guilty", insisting that defendants' accusers and their evidence be thoroughly tested in court. Garrow is best known for his criminal defence work and the example he set with his aggressive defence of clients. Garrow joined Lincoln's Inn in November 1778, and was called to the Bar on 27 November 1783. He quickly established a reputation as a criminal law barrister, particularly for the defendants, and in February 1793 was made a King's Counsel by HM Government to prosecute cases involving treason and felonies. Garrow is also known for his impact on the rules of evidence, coining the best evidence rule. His work was cited as recently as 1982 in the Supreme Court of Canada and 2006 in the Irish Court of Criminal Appeal. In 2009, BBC One broadcast Garrow's Law, a four-part fictionalised drama of Garrow's beginnings at the Old Bailey; a second series aired in late 2010.