Nevada Revised Statutes Title 27. Public Property and Purchasing § 331.220. Surreptitious electronic surveillance prohibited; exceptions

(a) Authorized by a court order issued to a public officer, based upon a showing of probable cause to believe that criminal activity is occurring on the property under surveillance;

(b) By a law enforcement agency pursuant to a criminal investigation;

(c) By a peace officer pursuant to NRS 289.830; or

(d) Which is necessary as part of a system of security used to protect and ensure the safety of persons on the grounds of the facility.