In accordance with the provisions of this section and pursuant to the requirements of Chapter 33 (§ 54.1-3300 et seq.), a licensed physician assistant shall have the authority to prescribe controlled substances and devices as set forth in Chapter 34 (§ 54.1-3400 et seq.), provided that the physician assistant has entered into and is, at the time of writing a prescription, a party to a practice agreement with a licensed physician or podiatrist that provides for the direction and supervision by such licensee of the prescriptive practices of the physician assistant. Such practice agreements shall include the controlled substances the physician assistant is or is not authorized to prescribe and may restrict such prescriptive authority as deemed appropriate by the physician or podiatrist providing direction and supervision. see full law