( September 8, 2026, 11:41 AM EDT) -- WASHINGTON, D.C. — The plaintiff bringing class claims against a car manufacturer over an alleged headrest defect on Sept. 4 filed a response brief with the U.S. Supreme Court urging it to deny a car manufacturer’s petition for a writ of certiorari over the enforceability of delegation clauses in arbitration agreements by nonsignatories, denying that there is a circuit split over the issue and writing that the Ninth Circuit U.S. Court of Appeals properly denied arbitration....