Nev. Admin. Code § 639.290
When a physician assistant possessing a registration certificate to prescribe and dispense controlled substances, poisons, dangerous drugs and devices or to prescribe and dispense poisons, dangerous drugs and devices is ill or absent from his or her duties, another physician assistant possessing such a registration certificate may perform the duties of the absent physician assistant with the consent and under the supervision of the supervising physician of the absent physician assistant. An inventory of drugs must be taken before the substitute begins his or her duties and again taken when the returning physician assistant resumes his or her duties. The inventories must be attested to by the signature of the supervising physician and copies submitted to the Executive Secretary upon the request of the Board.
Nev. Admin. Code § 639.290
NRS 639.070, 639.1373