Statutory interpretation, False Claims Act
Where a provision of a statute clarifies an ambiguity in a parallel earlier provision, the new reading may be retroactively applied.
Where the relator in a qui tam action under the False Claims Act merely supplies detail for things already known in outline from previous suits, the court does not have jurisdiction under the statute.
http://media.ca7.uscourts.gov/cgi-bin/rssExec.pl?Submit=Display&Path=Y2016/D01-04/C:15-1867:J:Posner:aut:T:fnOp:N:1680761:S:0
Since 2011. An occasional commonplacing of the U.S. Circuit Courts of Appeal.
Neither an authoritative statement of the law nor legal advice. Quick work.