California, United States of America
The following excerpt is from Reiter v. C. Martin Co., A141477 (Cal. App. 2015):
"[9:27] 'Joinder' in another's motion: It is common practice for attorneys to join in another party's motion by simply filing a pleading captioned 'Joinder in Motion of . . . for . . . ," stating that the joining party adopts the requests and the points and authorities contained in the joined motion. (See Barak v. Quisenberry Law Firm (2006) 135 Cal.App.4th 654, 660-661.)
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