Section 419B.842 - When arrest warrant authorized(1) No person required to appear as provided in ORS 419B.812 to 419B.839 shall without reasonable cause fail to appear or, where directed in the summons, to bring the child before the court.(2) If the summons cannot be served, if the person to whom the summons is directed fails to obey it or if it appears to the court that the summons will be ineffectual, the court may direct issuance of a warrant of arrest against the person summoned or against the child.