Statute of Limitations For Retaliation Under False Claims Act - 6 Years in 4th Circuit
But the dissent is not happy and other circuit courts are split. 6 years is a long time for a retaliation claim to survive, but the majority in United States v. Graham County Soil and Water Conservation District (4th Cir. 4/29/04) [pdf] found no ambiguity in the clear language of the statute. Given the disagreement sounds like one the Supreme Court will ultimately get to resolve.