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Nemo Iudex in Causa Sua

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Nemo iudex in causa sua

Nemo judex in causa sua (or nemo judex in sua causa) (which, in Latin, literally means "no-one is judge
in his own cause") is a principle of natural justice that no person can judge a case in which they have an
interest.[1][2] In many jurisdictions the rule is very strictly applied to any appearance of a possible bias, even
if there is actually none: "Justice must not only be done, but must be seen to be done".[3]

This principle may also be called:

nemo judex idoneus in propria causa est


nemo judex in parte sua
nemo judex in re sua
nemo debet esse judex in propria causa
in propria causa nemo judex

The legal effect of a breach of natural justice is normally to stop the proceedings and render any judgment
invalid; it should be quashed or appealed, but may be remitted for a valid re-hearing.

The phrase is credited to Sir Edward Coke in the seventeenth century,[4] but has also been attested as early
as 1544.[5] It appears in Arnett v. Kennedy, 416 U.S. 134, 197 (1974) ("we might start with a first principle:
'[N]o man shall be a judge in his own cause.' Bonham's Case, 8 Co. 114a, 118a, 77 Eng. Rep. 646, 652
(1610)").

See also
Audi alteram partem
Judicial disqualification
List of legal Latin terms

References
1. "Legal definition of Nemo judex in causa sua" (http://www.legal-glossary.org/nemo-judex-in-
sua-causa/). legal-glossary.org. 23 March 2013. Retrieved 24 February 2014.
2. Harris. An Introduction to Law. 8th Ed. 2016. p 474 (https://books.google.com/books?id=DE2
2CgAAQBAJ&pg=PA474)
3. R v Sussex Justices, ex parte McCarthy, [1924] 1 KB 256, [1923] All ER 233
4. "Show Me the Money: States, ABA Try to Figure Out When Campaign Cash Leads to a
Judge’s Recusal" (http://www.abajournal.com/magazine/article/show_me_the_money_state
s_aba_try_to_figure_out_when_campaign_cash_adds_up), ABA Journal, 1 March 2012
(retrieved 28 June 2017).
5. Zwingli, Ulrich (1544). "Operum: Ea, Quae in Genesim, Exodum, Esaiam & Ieremiam
prophetas, partim ex ore illius excepta, partim ab illo conscripta sunt, una cum Psalterio
Latinitate donato, co[n]tinens. Tomus Tertius" (https://books.google.com/books?id=L21WAA
AAcAAJ&q=Nemo%20iudex%20in%20causa%20sua&pg=PP185).

Further reading
Page, Jennifer M. (2015). "Many Men Are Good Judges in Their Own Case" (https://www.cai
rn.info/revue-raisons-politiques-2015-3-page-91.htm). Raisons Politiques. 59 (3): 91–107.
doi:10.3917/rai.059.0091 (https://doi.org/10.3917%2Frai.059.0091).

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