California, United States of America
The following excerpt is from Von Beltz v. Bentley Homes, LLC, B252408 (Cal. App. 2014):
The burden of proving each element of res judicata falls to the party seeking to assert it. (Ferraro v. Camarlinghi (2008) 161 Cal.App.4th 509, 529.) A judgment in an unlawful detainer action generally has limited res judicata effect because of the summary nature of such a proceeding. (Vella v. Hudgins (1977) 20 Cal.3d 251, 255.)
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