The MnPASS lanes are enforced by the Minnesota State Patrol (MSP). Eight full-time troopers currently enforce the MnPASS lanes.  

During the MnPASS hours of operation, troopers identify vehicles in the MnPASS lanes that do not have a MnPASS tag attached to the windshield. They then look for other occupants in the vehicle. If there isn't at least one other occupant in the vehicle, the driver can be pulled over and issued a citation. The troopers also look for vehicles that illegally cross the double, solid-white lines, which separate the MnPASS lanes from the general purpose lanes. Depending on the county in which they are issued, MnPASS citations can cost motorists up to $300.

Troopers use a variety of tools and techniques to identify MnPASS lane violations. Troopers generally park on the inside shoulder or drive in the general purpose lane adjacent to the MnPASS lane to identify violations. When they see a potential violation, they pull the suspected vehicle to the left, inside shoulder if there is sufficient shoulder width. Otherwise they pull the vehicle to the right outside shoulder to verify occupancy and issue a citation or a warning if a violation is confirmed. The troopers use mobile equipment to verify if a MnPASS tag is working, when it was last read and if an individual’s account is in good standing. MnDOT and MSP are also testing other equipment to improve the enforcement program and the troopers’ efficiency, effectiveness and safety such as beacons that indicate if a motorist has a valid MnPASS tag.

While the troopers’ primary focus is to identify MnPASS lane violations, they do not ignore other violations such as speeding, distracted driving or expired tabs. They also assist with incidents in the corridor if needed.