Wisconsin IID Requirements

Ignition InterlockDevices

An IID requires a breath sample before a vehicle can start and can restrict a driver to operating only properly equipped vehicles.

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Vehicle RestrictionUnderstand Which Vehicles Must Be Equipped

The court order, duration, vehicle ownership, exemptions, and occupational-license requirements should be reviewed.

Repeat OWIIID generally required

First OWIRequired at BAC .15 or higher

RefusalIID generally required

VehiclesOwned or registered vehicles

Overview

An IID Order Affects the Driver and the Vehicles

Wisconsin judges are generally required to order an IID for repeat OWI offenders, first offenders with an alcohol concentration of .15 or higher, and drivers found to have unlawfully refused a chemical test.

Important

The restriction applies to the operating privilege, and installation is generally required on vehicles owned by or registered to the person unless the court grants an exemption.

How the Device Works

The driver provides a breath sample before starting the vehicle. The system can prevent startup when the sample exceeds the programmed threshold and can require later samples.

Use an approved installation and service provider
Follow calibration and maintenance requirements
Keep installation and service records

When the Requirement Begins

The order and license restriction should be read carefully. Occupational-license issuance may require installation before the restricted license is granted.

Confirm the effective start and end dates
Do not assume the period runs while unlicensed
Verify reinstatement and occupational requirements

Vehicle Ownership and Exemptions

The general rule reaches vehicles owned by or registered to the driver. A court may consider exemptions in qualifying circumstances.

Identify every titled or registered vehicle
Address employer-owned vehicles separately
Obtain any exemption in writing

Practical Review

IID Compliance Checklist

Administrative mistakes can extend the period or create additional allegations.

Court order and DMV restriction dates
List of owned or registered vehicles
Approved installation vendor
Calibration and service schedule
Any court-approved vehicle exemption

Common Questions

Legal and Practical Context

These answers are general. The correct analysis depends on the facts, record, notices, and current law.

Repeat OWI offenders, first offenders with a BAC of .15 or higher, and drivers with an unlawful chemical-test refusal are common mandatory categories.

Generally, vehicles owned by or registered to the driver must be equipped unless an exemption applies.

When an IID restriction applies, proof of installation may be required before the occupational license is issued.

Tampering or circumvention can create additional legal consequences and may extend the required period.

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