NRS 171.124: Arrest by peace officer or officer of Drug Enforcement Administration.

1. Except as otherwise provided in subsection 3 and NRS 33.070 and 33.320, a peace officer or an officer of the Drug Enforcement Administration designated by the Attorney General of the United States for that purpose may make an arrest in obedience to a warrant delivered to him or her, or may, without a warrant, arrest a person:

(a) For a public offense committed or attempted in the officer’s presence.

(b) When a person arrested has committed a felony or gross misdemeanor, although not in the officer’s presence.

(c) When a felony or gross misdemeanor has in fact been committed, and the officer has reasonable cause for believing the person arrested to have committed it.

(d) On a charge made, upon a reasonable cause, of the commission of a felony or gross misdemeanor by the person arrested.

(e) When a warrant has in fact been issued in this State for the arrest of a named or described person for a public offense, and the officer has reasonable cause to believe that the person arrested is the person so named or described.

2. A peace officer or an officer of the Drug Enforcement Administration designated by the Attorney General of the United States for that purpose may also, at night, without a warrant, arrest any person whom the officer has reasonable cause for believing to have committed a felony or gross misdemeanor, and is justified in making the arrest, though it afterward appears that a felony or gross misdemeanor has not been committed.

3. An officer of the Drug Enforcement Administration may only make an arrest pursuant to subsections 1 and 2 for a violation of chapter 453 of NRS.