Nev. Rev. Stat. § 441A.163
1. Except as otherwise required pursuant to NRS 441A.160, a health authority may conduct an investigation of a case or suspected case of:
(b) Exposure to a biological, radiological or chemical agent within its jurisdiction,
which significantly impairs the health, safety or welfare of the public within its jurisdiction.
2. Each health authority shall:
(Added to NRS by 2009, 554)