N.D. Cent. Code § 29-06-20: When private person may arrest

A private person may arrest another:

1.For a public offense committed or attempted in the arresting person's presence.

2.When the person arrested has committed a felony, although not in the arresting person's presence.

3.When a felony has been in fact committed, and the arresting person has reasonable grounds to believe the person arrested to have committed it.