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Corpus Juris Secundum (CJS) is an encyclopedia of United States law at the federal and state levels. It is arranged into over 430 topics, which in turn are arranged into subheadings. As of 2010[update], CJS consisted of 164 bound volumes, 5 index volumes and 11 table of cases volumes.
CJS is named after the 6th century Corpus Juris Civilis of the Byzantine Emperor Justinian I, the first codification of Roman law and civil law. The name Corpus Juris literally means "body of the law"; Secundum denotes the second edition of the encyclopedia, which was originally issued as Corpus Juris by the American Law Book Company (from 1914 to 1937). CJS is published by West in print form and on Westlaw. The print edition is updated annually with pocket supplements and revised editions of bound volumes. Before Thomson's acquisition of West, CJS competed against the American Jurisprudence legal encyclopedia.
While legal encyclopedias like CJS were at one time heavily used by the courts, the growth of statutory and regulatory governance has had the effect of eroding this reliance. As such, rather than being used as sources of authoritative statements of law, legal encyclopedias will be more often used as tools for finding relevant case law.
Three volumes of Corpus Juris Secundum appear in the closing credits of the Perry Mason television series. As of the end of 2012, the set's publisher was Jean E. Maess and the publication editor was Michael N. Giuliano.