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.


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Vermont Department of Motor Vehicles
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Montpelier, VT 05603-0001

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