No Borrowed Crown: Supreme Court Holds Yearsley Is a Merits Defense, Not Immunity
by J.R. Howell
The Supreme Court’s decision in GEO Group, Inc. v. Menocal, 607 U.S. ___ (2026), clarifies an issue that had become increasingly muddled in government-contractor litigation: Yearsley is a defense to liability, not an immunity from suit. That distinction has immediate procedural consequences. Because Yearsley does not confer an entitlement not to stand trial, a district court’s denial of Yearsley protection is not immediately appealable under the collateral-order doctrine.
The case arose from claims brought by immigration detainees challenging labor policies at a private detention facility operated by GEO under contract with ICE. GEO argued that the challenged policies were authorized and directed by the federal government and therefore protected under Yearsley v. W.A. Ross Construction Co. But the district court found that GEO’s contract did not require those specific policies and concluded that GEO had independently developed and implemented them. GEO then sought an immediate appeal.
Justice Kagan’s opinion draws a crisp line between a true immunity and a merits defense. An immunity protects a defendant from suit regardless of whether its conduct was lawful. A merits defense, by contrast, argues that the defendant acted lawfully and therefore should not be held liable. Yearsley falls into the latter category because it protects contractors only when they act within the bounds of validly conferred governmental authority. If the contractor exceeds that authority, or if the authority was unlawfully conferred, the defense disappears.
That reasoning also drove the Court’s rejection of GEO’s effort to characterize Yearsley as “derivative sovereign immunity.” Sovereign immunity, the Court explained, belongs to the sovereign alone and does not pass to private actors merely because they perform government work. In that respect, the opinion is a marked change in the previously common tendency to recast contractor defenses as categorical immunity from litigation itself.
The practical result is significant. Contractors denied Yearsley protection can no longer treat that ruling as an automatic off-ramp to interlocutory appeal. In the ordinary case, they must continue litigating and seek appellate review only after final judgment, although § 1292(b) remains available where a district court certifies immediate review. For plaintiffs, that narrows a familiar delay mechanism. For contractors, it raises the premium on building a factual record showing that the challenged conduct was actually authorized and directed by the government, rather than merely adjacent to a federal contract.
The Court did not abolish Yearsley, but rather surgically altered the way the doctrine is litigated.