California, United States of America
The following excerpt is from Shah v. Shaw, G046448 (Cal. App. 2013):
witness concerning a particular matter is inadmissible unless he has personal knowledge of the matter"].) "[A]n affidavit is normally presumed to state matters personally known to the affiant and lacks evidentiary value, in a variety of civil contexts, when based on information and belief, or hearsay." (City of Santa Cruz v. Municipal Court (1989) 49 Cal.3d 74, 87.)
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