On August 11, 2015, the U.S. Court of Appeals for the D.C. Circuit issued a writ of mandamus supporting the robust applicability of the attorney-client privilege and attorney work product doctrines in the context of False Claims Act (“FCA”) investigations conducted under the direction of corporate and outside counsel. This marks a continuation of its repudiation of a 2014 lower-court decision that significantly eroded these privileges. Interpreting the scope of the privileges in the context of internal investigations of potential FCA violations is especially tricky because of the unique roles played by the parties (the Government as a potential plaintiff, the relator as a bounty hunter, and the corporation-as-defendant). This latest ruling from the D.C. Circuit, in a case arising out of wartime contracts in Iraq run by Kellogg, Brown & Root, Inc. (“KBR”)(formerly part of Halliburton), is a breath of fresh air for companies doing business with the Federal Government. The ruling from the Court of Appeals also sends a signal to the trial court that an overly narrow view of the attorney-client privilege and attorney work product doctrine creates unacceptable uncertainty that will ultimately be rejected on appeal.