---
title: "What is BAIID (Breath Alcohol Ignition Interlock Device)?"
description: "The BAIID (Breath Alcohol Ignition Interlock Device) is a court-approved breath testing device installed on the ignition system of a vehicle. Before the engine will start, the driver blows into the..."
url: https://chicagoduilawyer.net/faq-items/what-is-baiid-breath-alcohol-ignition-interlock-device/
date: 2026-07-08
modified: 2026-07-08
author: "Chicago DUI Lawyer"
type: faq
lang: en
---

# What is BAIID (Breath Alcohol Ignition Interlock Device)?

The **BAIID (Breath Alcohol Ignition Interlock Device)** is a court-approved breath testing device installed on the ignition system of a vehicle. Before the engine will start, the driver blows into the device and must register below a preset threshold (typically 0.025 BAC in Illinois). The unit also requires rolling retests while driving, and has a camera that photographs the driver during each test to prevent circumvention. BAIID is required for anyone driving on an MDDP or RDP after an Illinois DUI. The driver pays roughly $85 to install, plus monthly monitoring fees around $80. Any failed test, missed rolling retest, or tamper alert is reported to the Secretary of State and can extend the monitoring period or trigger revocation.