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Ignition Interlock Devices

​​​​​​​​​​​​​​​​​​​​​North Carolina G.S. 20-17.8 and G.S. 20-179.3 define when a driver is required to have the ignition interlock restriction on a license after certain convictions or affidavits. 

Connected to a vehicle's ignition system, an ignition interlock device requires an individual to breathe into the equipment, which prevents the vehicle from starting if the individual's breath alcohol concentration is outside the acceptable range.

Ignition interlock devices are installed at the expense of the driver.

The N.C. Division of Motor Vehicles can waive ignition interlock installations on additional vehicles for applicants who meet household income criteria and have submitted an DMV Interlock Hardship​ with their written hearing request. The form is also available in Spanish.

Effective June 1, 2022, a person who is ordered by a court, or required by statute, to install an ignition interlock system to lawfully operate a motor vehicle, but who is unable to afford the cost of an ignition interlock system, may apply to an authorized vendor for a waiver of a portion of the costs of an ignition interlock system. A person who ​​applies for a waiver of the portion of the costs of an ignition interlock system shall provide the completed Vendor Interlock Hardship​ ​to an authorized vendor.

Ignition Interlock Providers

Provider Phone Number
Smart Start Inc. (866) 418-6255
ALCOLOCK NC Inc. (855) 664-0353
Monitech Inc. (800) 345-8535
Intoxalock (888) 205-1921

Continuous Alcohol Monitoring

In certain cases, NCDMV may grant the use of a continuous alcohol monitor device. Call (919) 715-7000 for more information.

Provider Phone Number
Carolina Monitoring Associates(252) 702-5060
​Continuous Alcohol Monitoring LLC
​(800) 464-5917
Offender Management Services(803) 814-3216
Rehabilitation Support Services(866) 273-4223, ext. 601
Reliant Management Group(919) 754-9422
Sandhills Monitoring LLC(910) 984-1009
Tarheel Monitoring(910) 763-1490
Tarheel Monitoring West(704) 253-1054

6/6/2024 12:43 PM

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