Ignition Interlock Device

Does the IID need to be serviced or maintained in any way?

Yes.  Once installed in your vehicle, the IID must be calibrated and inspected by a certified installer, or “swapped out” (if applicable), every 30 days for the duration of the terms and requirements of an RDL.  The inspection is done to make sure the IID is working properly and to detect any issues of non-compliance.  At the time of inspection, the installer will:

  • Review the data recorded in the device’s memory.
  • Inspect the device for indications of tampering.
  • Calibrate the device.
  • Forward data reports to both DMV.

What is a “random retest”?

To prevent a driver from having someone else blow into the IID to start a vehicle, and to prevent a driver from drinking while driving, the IID requires the driver to submit to random retests at variable intervals after a driver has passed an initial breath test and started the vehicle.  The IID will signal you to take a retest within a certain amount of time after starting your vehicle.

Does it matter what type of IID I have installed?


  • You must install an IID that is equipped with a camera. 
  • if your BAC was .16 or above, you will be required to install a camera-equipped IID with GPS capabilities, and have it in your vehicle for the entire period of time you must operate under the terms and requirements of an RDL.
  • in some cases, the courts or Department of Corrections may require you to install a device that has “Real-Time” reporting” and/or GPS capabilities.

What if my vehicle has been wrecked?

Contact your installer for specific instructions on how to handle this situation.  Depending upon the amount of damage to your vehicle, you may need to obtain a new IID.  Should you have to replace your vehicle, you will need to have a device installed in your new vehicle.  Have the installer complete a Certification of Ignition Interlock Device Installation, VL-082, and return it to this Department.

What if I voluntarily remove the IID from my vehicle before I am eligible to have it removed?

If you remove the IID from your vehicle before you are eligible, we will receive notification from the IID installer/manufacturer, you will be suspended for the remaining term of your original suspension.  A new suspension with a 10-day lead time will be mailed to you.  The lead time and any Departmental processing time will not be counted towards your suspension.

What is an Ignition Interlock Device

An Ignition Interlock Device, referred to as an “IID”, is an after-market device which is installed in a vehicle.  The IID is connected to the starter or ignition, or other on-board computer system of a vehicle.  The device prevents a driver from operating the vehicle if the driver has been drinking.  Before starting the vehicle, a driver must blow into the device; if the driver’s BAC is at or over a pre-set limit, 0.02 in Vermont, the IID will not allow the vehicle to start.  Once the vehicle is started, at random times during the operation of the vehicle, the device will prompt the driver

IID Certification of Installation

30 November 2016
Certification completed by the installer of the IID. Installer must be certified to provide ignition interlock device services in Vermont.


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