NRS 200.140: Justifiable homicide by peace officer.

1. Homicide is justifiable when committed by a peace officer, or person acting under the command and in the aid of the peace officer, in the following cases:

(a) In obedience to the judgment of a competent court.

(b) When necessary to overcome actual resistance to the execution of the legal process, mandate or order of a court or officer, or in the discharge of a legal duty.

(c) When necessary:

(1) In retaking an escaped or rescued prisoner who has been committed, arrested for, or convicted of a felony;

(2) In attempting, by lawful ways or means and in accordance with the provisions of NRS 171.1455, to apprehend or arrest a person;

(3) In lawfully suppressing a riot or preserving the peace; or

(4) Except as otherwise provided in NRS 193.304, in protecting against an imminent threat to the life of a person.

2. As used in this section, “peace officer” has the meaning ascribed to it in NRS 169.125.