When will a court admit or exclude evidence in a civil case?

We need not decide whether the court erred in admitting this evidence because we conclude any such error was harmless, as it was not reasonably probable that, absent such error, a result more favorable to defendant would have been reached. (See People v. McNeal (2009) 46 Cal.4th 1183, 1203 (McNeal) [noting a trial court's error under state

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law in the admission or exclusion of evidence following an exercise of discretion is properly reviewed for prejudice under Watson]; People v. Hovarter (2008) 44 Cal.4th 983, 1010 [concluding the " 'routine application of state evidentiary law does not implicate [a] defendant's constitutional rights' "].)