Any witness neglecting or refusing to attend in obedience to a subpoena may be arrested by the sergeant at arms and brought before the senate or house. The only warrant of authority necessary to authorize the arrest is a copy of a resolution of the senate or house, signed by the president of the senate or speaker of the house and countersigned by the secretary or clerk.
Compelling Attendance
Mont. Code Ann. § 5-5-111, under Legislature Investigative Powers.
Mont. Code Ann. § 5-5-111