What is the legal test for admitting evidence in a civil case?

"'[T]he admission of evidence, even if erroneous under state law, results in a due process violation only if it makes the trial fundamentally unfair.'" (Italics deleted.) (People v. Albarran, supra, 149 Cal.App.4th at p. 229.) To prove a deprivation of federal due process rights, [appellants] must satisfy a high constitutional standard to show that the erroneous admission of evidence resulted in an unfair trial. 'Only if there are no permissible inferences the jury may draw from the evidence can its admission violate due process. Even then, the evidence must "be of such quality as necessarily prevents a fair trial." Only under such circumstances can it be inferred that the jury must have used the evidence for an improper purpose.' 'The dispositive issue is . . . whether the trial court committed an error which rendered the trial "so 'arbitrary and fundamentally unfair' that it violated federal due process."'" (Citations omitted.) (Id. at pp. 229-230.)

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