Last week, the U.S. Court of Appeals for the Fifth Circuit considered an appeal from the Eastern District of Louisiana, which dismissed appellants’ FCA retaliation claims based on res judicata. Res judicata, or “claim preclusion,” is the principle that a matter may not be re-litigated once it has been decided on the merits. Appellants had previously brought employment discrimination actions against Lockheed Martin alleging they...