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Formal Opinion 97-407 May 13, 1997 Lawyer as Expert Witness or Expert Consultant A lawyer serving as an expert witness to testify on behalf of a party who is another law firm’s client, as distinct from an expert consultaant does not thereby establish a client-lawyer relationship with the party or provide a “law-related service” to the party within the purview of Model Rule 5.7 such as would render his services as a testifying expert subject to the Model Rules of Professional Conduct. However, to...