Ignition Interlock Device

If you are convicted of an OWI with an alcohol concentration of .15% or greater or OWI/refusal to submit to a chemical test, the court MUST order:

  1. An ignition interlock device (IID) installed on every vehicle that is titled or registered in your name*; and
  2. A restriction of your operating privileges to only vehicles equipped with an IID.

The IID restriction period is a minimum of one (1) year.  The Court Clerk will notify the Department of Transportation (DOT) of all court orders requiring IID installation.

You will not be able to obtain an occupational license or reinstate your regular license unless you provide the DMV with proof that an IID has been installed on every vehicle that is titled or registered in your name.*  The occupational license or reinstated regular license will have Class D operating privileges restricted to vehicles equipped with an IID.

What is an ignition interlock device (IID) or breath alcohol ignition interlock device (BIID)?

It is a mechanism that is installed on a motor vehicle's dashboard.  Before the vehicle can be started, the driver must first exhale into the device.  If the breath alcohol concentration analyzed is greater than the programmed blood alcohol concentration (.02%), the device prevents the engine from starting.

Who do I contact about having an IID installed?

The Chemical Test Section of the Wisconsin Division of State Patrol is responsible for approving manufacturers and their devices for use in the State of Wisconsin. For a list of approved vendors, please check the DOT's website at:

How much does the IID and installation cost?

Please call the vendors for current installation and maintenance pricing. 

For questions concerning the IID device, manufacturers or vendors, please contact:

Chemical Test Section 608-266-0084.

For questions concerning IID forms or drivers' record maintenance, please contact:

DMV Compliance and Restoration Unit:

Failure to install, removal, disconnection, tampering with, or circumvention of the IID is a criminal offense and may result in a fine and/or up to six (6) months in jail, plus a mandatory six (6) month extension of the IID order period.

Exemptions will be granted by the court only upon a finding of undue financial hardship where appropriate evidence is presented.