patients on— (1) circumstances under which a pharmacist may, consistent with section 309 of the Controlled Substances Act ( 21 U.S.C. 829 ) and regulations thereunder, including section 1306.04 of title 21, Code of Federal Regulations, decline to fill a prescription for a controlled substance because the pharmacist suspects the prescription is fraudulent, forged, or of doubtful, questionable, or suspicious origin