K.S.A. 22-2403: Arrest by private person.

A person who is not a law enforcement officer may arrest another person when:

(1) A felony has been or is being committed and the person making the arrest has probable cause to believe that the arrested person is guilty thereof; or

(2) any crime, other than a traffic infraction or a cigarette or tobacco infraction, has been or is being committed by the arrested person in the view of the person making the arrest.