Montana Title 46. Criminal Procedure § 46-6-411. Assisting officer of another state

(1) Any peace officer of another state, of the United States, or of the District of Columbia who enters this state in close pursuit of a person in order to arrest the person has the same authority to arrest and hold the person in custody as peace officers of this state have to arrest and hold in custody a person on the ground that the person has committed a crime in this state.

(2) If an arrest is made in this state by an officer of another state, of the United States, or of the District of Columbia, the officer shall without unnecessary delay take the arrested person before a judge of a court of record, who shall conduct a hearing for the sole purpose of determining if the arrest was in accordance with the provisions of subsection (1) and not for the purpose of determining the guilt or innocence of the arrested person.

(3) If the judge determines that the arrest was in accordance with subsection (1), the judge shall commit the arrested person to the custody of the officer making the arrest, who shall without unnecessary delay take the arrested person to the state from which that person fled. If the judge determines that the arrest was unlawful, the judge shall discharge the person arrested.

(4) This section may not be construed to make unlawful any arrest in this state that would otherwise be lawful.