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In a feature article in IDC Quarterly, Circuit Judge Donald J. O'Brien, Jr. (Ret.) and Johnson & Bell Shareholder, Charles P. Rantis, delve into the facts and other materials expert witnesses can and cannot include in their testimony at trial.  The authors outline how the adoption of Federal Rules of Evidence 703 and 705 by the Illinois Supreme Court in Wilson v. Clark laid the groundwork for a more practical and efficient use of expert testimony at trial.