In Shadow Traffic Network v. Superior Court (1994) 24 Cal.App.4th 1067, the Court of Appeal stated that where counsel retains an expert consultant with confidential information concerning the opponent’s case, there is a rebuttable presumption that the expert shared that confidential information with the counsel that retained him or her, which requires disqualification. See Evid Code §606 on the effect of a presumption. To prevent disqualification, the presumption must be rebutted with an affirmative evidentiary showing that no confidential materials were transmitted. This showing has been met by including the writings that were transmitted and what topics were discussed verbally, which would demonstrate that the offending material was not transmitted. However, be mindful that it is not just the precise materials, but also the benefit of the confidential materials that must be rebutted:
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