Federal Court Weighs Constitutionality of False Claims Act Whistleblower Provisions

A three-judge panel of the Eleventh Circuit Court of Appeals heard oral arguments on December 12 in a case that could fundamentally reshape how whistleblower lawsuits operate under the False Claims Act (FCA). The closely watched appeal challenges a 2024 ruling from a Florida federal judge who declared the FCA’s qui tam provisions—which allow private citizens to file fraud lawsuits on behalf of the government—unconstitutional.

The case, United States ex rel. Zafirov v. Florida Medical Associates, LLC, has drawn significant attention from legal observers as it could potentially disrupt thousands of ongoing whistleblower cases nationwide. The Department of Justice and whistleblower Clarissa Zafirov are appealing a decision by U.S. District Judge Kathryn Kimball Mizelle, who ruled that the qui tam provisions violate the Constitution’s Appointments Clause under Article II.

Judge Mizelle, a former law clerk to Supreme Court Justice Clarence Thomas, concluded that whistleblowers (known as “relators”) effectively function as unappointed federal “Officers” when they pursue cases in the government’s name. Her reasoning closely parallels Justice Thomas’s dissenting opinion in a 2023 Supreme Court case that reignited this constitutional debate.

During oral arguments, the Eleventh Circuit panel—comprised of Judges Elizabeth Branch, Robert Luck, and Federico Moreno—appeared open to reconsidering the constitutionality question despite previous circuit court rulings upholding the provisions. Judge Branch notably dismissed the Justice Department’s reliance on historical precedent, observing that none of the prior circuit decisions were recent and that several Supreme Court Justices have explicitly called for reexamination of the issue.

The case has attracted more than a dozen amicus briefs from interested parties, including Senator Chuck Grassley arguing for constitutionality and the U.S. Chamber of Commerce supporting the district court’s ruling against the qui tam provisions.

The appeals court’s questioning focused on two key constitutional concerns. First, whether whistleblowers occupy “continuing” positions that would classify them as “Officers” under the Appointments Clause. Second, whether relators improperly exercise executive power in violation of Article II’s Vesting and Take Care Clauses by initiating lawsuits without government approval.

While Judge Mizelle’s ruling remains an outlier—every other district court to consider the question since 2023 has rejected the constitutional challenge—similar cases are now pending in the Third and Sixth Circuits. Additionally, judges in the Fifth Circuit have signaled openness to revisiting their circuit’s 2001 decision upholding the qui tam provisions.

The practical implications of striking down the FCA’s qui tam provisions would be far-reaching. Whistleblower cases represent the vast majority of FCA litigation and have recovered billions of dollars for taxpayers in fraud cases involving healthcare, defense contracting, and other government programs.

Should the Eleventh Circuit affirm Judge Mizelle’s ruling, the Justice Department would face several options to salvage ongoing whistleblower cases, including intervening directly in pending matters or creating alternative whistleblower mechanisms similar to those used by the SEC and other agencies.

Legal experts widely expect the case to reach the Supreme Court regardless of the Eleventh Circuit’s decision. With three current Justices already having expressed “substantial questions” about the constitutionality of the qui tam provisions, the stage appears set for a landmark ruling that could transform how whistleblower cases operate in the federal system.

Congress may ultimately need to revise the FCA to address any constitutional defects identified by the courts, potentially by requiring Justice Department pre-approval of whistleblower lawsuits or implementing other oversight mechanisms that satisfy Article II concerns while preserving incentives for whistleblowers to report fraud against the government.