Nev. Rev. Stat. § 284.4063
1. Except as otherwise provided in subsection 2 and subsection 5 of NRS 284.4065, an employee who:
(c) After taking a screening test which indicates the presence of a controlled substance, fails to provide proof, within 72 hours after being requested by the employee’s appointing authority, that the employee had taken the controlled substance as directed pursuant to a current and lawful prescription issued in the employee’s name,
is subject to disciplinary action.
(Added to NRS by 1991, 1349; A 1993, 2252; 2015, 1048; 2019, 3865)