The Common Practice Agreement specifically refers to each condition of the disease that is jointly managed. A patient is referred by a caring physician to that doctor`s cooperating pharmacist, informed of the cooperation and agrees to cooperate. No agreement on common practice in the retail trade in medicinal products may permit the prescription of controlled substances in List II to V within the meaning of Chapter 94C, Section 3. A retail pharmacist who has entered into a cooperation contract with a medical practitioner specifically authorising the first prescriptions for patients transferred from the medical practitioner may issue prescriptions for controlled substances in List VI within the meaning of Section 3, Section 6, of Chapter 94C. These prescriptions apply to a patient diagnosis indicated in the individual treatment of the attending physician on that patient. . . .