The U.S. Supreme Court has apparently approved changes to the rules governing expert discovery in federal court. These changes are set to take effect December 1, 2010.  The most interesting, and the one drawing attention at this time, is the Supreme Court‘s exempting of drafts of expert reports from discovery. The Committee on Rules of Practice and Procedure proposed changing Fed. R. Civ. P. 26(a)(2)(B) so that only the "facts or data considered by the witness" in forming the expert opinions must be disclosed, instead of all "data or other information" upon which the expert relied.  Drafts of expert reports will be immune form discovery, apparently unless a party could show substantial hardship. The purpose of this modification was to streamline litigation.  The new rule will still allow discovery of communications between counsel and expert on the topics of compensation, assumptions and facts and data provided by the attorney. Now, however, the prior drafts of expert reports appear to be privileged from discovery.

The commentary seems to suggest that discovery along these avenues has not been fruitful, and has just taken up much discovery time. I have had experiences where it has been of limited utility, but usually about once a year, I have a case where an attorney’s modification to an expert’s preliminary report has caused concern or been a hot topic of examination. I was surprised to learn that this modification was supposed by both plaintiff and defense lawyers. 

I believe this modification is "final," so to speak, so watch out for it and plan accordingly in your federal litigation.