Montana Title 46. Criminal Procedure § 46-5-502. Authority to establish temporary roadblocks

(a) apprehend persons known to be wanted for a violation of the laws of this state, of any other state, or of the United States;

(b) except as provided in 7-33-2212, respond to an active emergency; or

(c) respond to or mitigate conditions in areas where a significant number of known causal factors of motor vehicle accidents involving fatalities, injuries, or other serious legal violations are known to have occurred.

(a) “Active emergency” means an incident that threatens public safety, health, or welfare and requires immediate action.

(b) “Secondary offense” means a violation of an offense, including a violation of 61-13-103, for which a law enforcement officer may only issue a ticket, citation, or summons after the driver has already been stopped for a violation of another offense.