The city or town council has power to make regulations authorizing the police of the city or town to make arrests of persons charged with crime: (1) within the limits of the city or town; (2) within 5 miles thereof; and (3) along the line of water supply of the city or town.
Regulations Governing Arrest Authorized
Mont. Code Ann. § 7-32-4301, under Powers of Municipal Council Related to Law Enforcement.
Mont. Code Ann. § 7-32-4301