After a DUI conviction, hearing you must install an ignition interlock device (IID) can feel like another obstacle in an already difficult process. But understanding how IIDs work—and when California law requires them—can help you stay compliant and regain driving privileges faster. At Braden & Tucci, we’ve guided thousands of drivers through IID compliance, exemptions, and appeals under California’s SB1046 law.
What Is an Ignition Interlock Device?
An IID is a small breath-testing unit wired into a vehicle’s ignition system. Before starting the engine, the driver must blow into the device. If alcohol is detected, the vehicle will not start. This safeguard allows individuals with DUI convictions to resume limited driving while proving ongoing sobriety.
How IIDs Work in Daily Life
Each time you start the car, the IID requires a breath test. Rolling re-tests may occur during trips to ensure continued sobriety. Failing or missing a test locks the ignition and is logged for the court or DMV. Units require servicing roughly every 60 days to download data and maintain calibration.
California’s SB1046: Statewide IID Mandate
Senate Bill 1046 made ignition interlock installation mandatory for all DUI convictions in California through 2026. Previously a pilot program in select counties, SB1046 now applies statewide. First-time offenders typically serve 5 months with an IID; repeat offenders face longer terms—up to 4 years for chronic cases.
Installing early allows for restricted driving rather than a total suspension. According to DMV data, IID use substantially reduces repeat DUI offenses while improving public safety.
Installation, Costs, and Compliance Tips
Drivers must choose a DMV-approved IID provider. Installation usually costs $75–$125, with monthly monitoring fees averaging $60–$90. Low-income assistance programs can reduce these costs by up to 90%. Regular calibration and documentation prevent violation reports or extensions.
Exemptions and Legal Relief
Exemptions are limited but possible for medical or mechanical hardship reasons. Our firm’s success in chronic-offender defense has helped clients secure exemptions or early terminations when compliance would cause disproportionate hardship.
Frequently Asked Questions
When is an IID required?
For all DUI convictions under SB1046, with mandatory installation starting at 5 months for first offenses.
How much does an IID cost?
Expect about $3 per day, with setup fees between $75–$125. Financial aid programs exist for qualifying drivers.
What happens if I fail a breath test?
The system records the event, and repeated failures can extend IID terms or prompt DMV action. Consult an attorney immediately.
Can I get an IID exemption?
Possibly. Exemptions are rare and must be approved by the court or DMV for specific medical or hardship conditions.
Do I need a lawyer for IID compliance?
Yes—legal representation ensures proper timing, avoids costly violations, and helps secure early reinstatement.
The Bottom Line
Ignition interlock devices are an essential part of California’s DUI sentencing system—but they don’t have to derail your life. With professional legal help, most drivers can keep working, driving, and moving forward responsibly.
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