l rational means for ascertaining the truth, Adkins v. Christie, 488 F.3d 1324 (11" Cir. 2007), citing United States v. Nixon, 418 U.S. 683, 710, 94 S. Ct 3090, 3108, 41 L.Ed. 2d 1039 (1974)( privileges are in derogation of the search for truth and should not be lightly created nor expansively construed),