In an appeal of a jury verdict against insurer Unum Group, a panel of the 1st U.S. Circuit Court of Appeals repeatedly grilled a whistleblower’s attorney. The lawyer was seeking affirmation of the verdict, which found that Unum violated the False Claims Act by causing its insureds to file false Social Security Disability Insurance claims.

On Momday, the three-judge panel, which included retired U.S. Supreme Court Justice David Souter, heard oral argument in U.S. ex. rel. Loughren v. Unum Group, an appeal challenging the liability standard for private insurance companies.