the otherwise liberal discovery rules, and 'undermine[s] to some degree the trial system's capacity to ascertain the truth." United States ex rel. DRC, Inc. v. Custer Battles, LLC, 415 F.Supp.2d 628, 632 (E.D. Va. 2006) (quoting Robert Heidt, The 8 EFTA00234878 Case 9:08-cv-80119-KAM Document 165 E