Incompetent person cannot be tried or adjudged to punishment for public offense.

NRS 178.400 Incompetent person cannot be tried or adjudged to punishment for public offense. 1. A person may not be tried or adjudged to punishment for a public offense while incompetent. 2. For the purposes of this section, “incompetent” means that the person does not have the present ability to: (a) Understand the nature of the criminal charges against the person; (b) Understand the nature and purpose of the court proceedings; or (c) Aid and assist the person’s counsel in the defense at any time during the proceedings with a reasonable degree of rational understanding. [1911 Cr. Prac. § 535; RL § 7385; NCL § 11183]—(NRS A 1981, 1656; 1995, 2458; 2007, 185)