California, United States of America
The following excerpt is from People v. Rios, B218445 (Cal. App. 2011):
It is well established that "'[a]llowing false testimony to go unchallenged impairs the integrity of the factfinding objective of a trial [citation], because such testimony hinders or blocks the disclosure of the truth to the trier of fact [citation].' [Citation.] A criminal judgment obtained through the use of false evidence violates due process.... [Citations.]" (Campbell v. Superior Court (2008) 159 Cal.App.4th 635, 652.)
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