An ignition interlock device (IID) is a breathalyzer installed in your vehicle that prevents the engine from starting if your BAC exceeds a preset limit (usually 0.02-0.04%).
How It Works
Before starting your car, you blow into the device. If your BAC is below the threshold, the car starts normally. While driving, the device requires random "rolling retests" to ensure continued sobriety.
Costs Breakdown
Installation: $100-$200. Monthly lease/monitoring: $60-$100. Calibration (monthly): Usually included. Removal: $50-$100. Total for 12 months: $1,000-$1,500.
Major IID Providers
The four largest providers are Intoxalock, Smart Start, LifeSafer, and Draeger. Each has different pricing, device features, and service center availability.
Tips for Success
Avoid mouthwash, hand sanitizer, and certain foods before blowing. Wait 15 minutes after eating or drinking anything. Keep your device calibration appointments. Never have someone else blow for you — it's a crime.