Whether the Ninth Circuit's decision affirming the refusal to give a buyer-seller instruction in a drug conspiracy case conflicts with this Court's holding in Mathews v. United States

Whether the Ninth Circuit’s decision affirming the refusal to give a buyer-seller instruction in a drug conspiracy case conflicts with this Court’s holding in Mathews v. United States, 485 U.S. 58, 63 (1988) that a defendant is entitled to an instruction as to any recognized defense for which there exists evidence sufficient for a reasonable jury to find in his favor?