Oregon Revised Statutes Procedure in Criminal Matters Generally § 133.245

(a) For any crime committed in the federal officer's presence if the federal officer has probable cause to believe the person committed the crime.

(b) For any felony or Class A misdemeanor if the federal officer has probable cause to believe the person committed the crime.

(c) When rendering assistance to or at the request of a law enforcement officer, as defined in ORS 414.805.

(d) When the federal officer has received positive information in writing or by telephone, telegraph, teletype, radio, facsimile machine or other authoritative source that a peace officer holds a warrant for the person's arrest.

(4)(a) A federal officer making an arrest under this section without unnecessary delay shall take the arrested person before a magistrate or deliver the arrested person to a peace officer.

(b) The federal officer retains authority over the arrested person only until the person appears before a magistrate or until the law enforcement agency having general jurisdiction over the area in which the arrest took place assumes responsibility for the person.