If you’ve been arrested for DUI in California, you’ll probably hear the term “IID” almost immediately—and usually with a lot of stress attached. An Ignition Interlock Device can feel like an expensive, embarrassing hassle, and people often worry about cost, privacy, and how it will affect daily life. It’s also common to feel overwhelmed because IID rules can come from multiple directions at once, including the DMV and the court.
But in many DUI situations, an IID is also the fastest legal path to driving again. That’s because an IID restriction can allow you to drive anytime and anywhere, instead of being limited to work-only or program-only driving—so long as you’re driving a vehicle equipped with the IID and you stay compliant with the restriction requirements.
What Is an Ignition Interlock Device
An IID is a breath-alcohol device installed in a vehicle. Before the car will start, the driver must provide a breath sample. If the device detects alcohol at or above a set threshold, it prevents the engine from starting. Many IID setups also require rolling retests after the vehicle is already running.
From a legal standpoint, the most important point is not the technology. It’s what the IID is tied to: driving privilege. IID installation often connects directly to a restricted license or reinstatement requirements after a DUI.
This page and website provide general information in plain English, not legal advice. Laws and local court/DMV practices vary and can change, so don’t rely on this content for your case—talk to a qualified attorney promptly to review your specific facts, especially if you face charges, a DMV action, or a deadline. In many cases, you’re fighting two battles at once: the DMV process and the criminal court case.
Why California Uses IIDs
California’s IID framework is designed to create a tradeoff: more driving freedom in exchange for more compliance. The DMV explains that under the statewide IID program, drivers who install an IID may drive anytime or anywhere, as long as the vehicle is equipped with an IID.
That matters because older-style restrictions can be far more limiting, often restricting driving to work, during work, and to and from a DUI program. For many people in Southern California, that kind of restriction is not realistic. An IID restriction is often more workable day-to-day, even though it adds cost and oversight.
Who Has to Install an IID After a DUI
Whether you must install an IID depends on several moving parts, including your prior history, whether the case involves injury, and whether you’re dealing with DMV action, court requirements, or both. It can also depend on which pathway you choose to get back on the road—because sometimes the IID is mandatory, and sometimes it’s the option that unlocks broader driving privileges.
One of the clearest rules in DMV guidance is this: under California’s statewide IID program, repeat offenders and injury-involved DUI offenders must install an IID for a period that can range from one to four years depending on the number of priors.
That’s why a DUI defense strategy should coordinate the “two tracks” early: the DMV track (APS and license action) and the criminal court track (charges and sentence terms). If those tracks aren’t coordinated, people end up surprised by restrictions, deadlines, or a longer path to reinstatement.
First-Offense DUI
For many first-offense, non-injury alcohol DUIs (21+), the DMV describes two common restricted-license routes.
One route is the IID restriction. Under this option, the DMV states you may drive at any time and to any place as long as the vehicle is equipped with an IID, and you keep the restriction until you meet reinstatement requirements. The DMV handout for first offenders lists steps that typically include proof of DUI program enrollment, proof of insurance (SR-22), proof of IID installation (often referenced as DL 920), and payment of the required fees.
The other route is a work/treatment program restriction. This option limits driving to work and DUI program needs and has its own proof and fee requirements. In practice, many people choose the IID route because it tends to fit real life better—especially in Southern California where driving is essential.
Repeat Offenders and Injury DUIs
For repeat offenses and injury-related DUIs, the IID requirement is often not optional. DMV guidance describes repeat and injury-involved IID terms in the one-to-four-year range depending on prior history, and repeat offender reinstatement materials commonly emphasize that reinstatement requires completing the IID term (or an approved exemption term if granted), plus meeting DUI program and SR-22 requirements.
Plain English: for many repeat or injury cases, the IID isn’t just a “restriction option”—it’s the core condition you must satisfy to get fully reinstated.
What Proof DMV Usually Requires for an IID Restricted License
For most people, the most helpful part of this page is a clean checklist.
For many IID restriction applications (especially first-offender frameworks), DMV materials typically require:
• Proof of enrollment in a DUI program
• Proof of insurance (SR-22)
• Proof of IID installation (often DL 920)
• Required fees (reissue/restriction/IID-related fees)
For repeat-offender reinstatement, DMV materials often emphasize:
• Completion of the mandatory IID term (or approved exemption term)
• Proof of DUI program completion
• SR-22 proof of insurance
SR-22 and DUI Program Requirements
Two requirements show up again and again across DMV materials.
SR-22 is proof of financial responsibility, and it’s commonly required as part of IID restriction and reinstatement requirements. DUI program enrollment is commonly required for restriction applications, and DUI program completion is commonly required for full reinstatement later.
Plain English: DMV wants to see you’re meeting the program requirement and that you’re insured appropriately before it restores driving privileges.
How to Install an IID
People often search “DMV approved IID list” and “approved IID installer,” so this section should be direct and practical.
Start by choosing an approved IID manufacturer/device. The DMV maintains a list of approved IID manufacturers and devices.
Next, confirm the installer is properly licensed. DMV “fast facts” style materials commonly advise that authorized IID manufacturers can provide a list of facilities, and they recommend verifying that the installer has a valid license through the appropriate California licensing authority (often tied to the Bureau of Automotive Repair or other Department of Consumer Affairs licensing framework).
After installation, you’ll need proof for DMV. In first-offender IID materials, DMV commonly references proof of IID installation using a DMV form identifier (DL 920). Including “DL 920” on this page is important because people often search that exact form after being told what they need.
What Happens If You Drive a Vehicle Without an IID
If your license is IID-restricted, you generally can’t legally drive a vehicle that does not have the IID installed. The DMV’s “drive anywhere” benefit is tied to the condition that the vehicle you’re driving is equipped with the IID. That means the restriction can be very unforgiving in real life if you borrow a car, drive a family member’s vehicle, or drive a work vehicle that isn’t equipped.
There are also statutory details that come up in real cases. For example, Vehicle Code section 23575 includes provisions about IID requirements and exceptions in certain out-of-state or non-California driving scenarios. The exact impact depends on the facts and the specific restriction or court order, so it’s something your lawyer should review carefully before you assume you’re “allowed” to drive a vehicle without an IID.
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Frequently Asked Questions About California IIDs
Can I drive anywhere with an IID restriction?
DMV states that offenders who install an IID may drive anytime or anywhere, as long as the vehicle is equipped with an IID.
DMV’s first-offender handout similarly states that with the IID restriction you may drive at any time to any place so long as the vehicle is equipped with an IID.
How do I know which IID devices are approved?
DMV publishes an Ignition Interlock Device List of approved manufacturers/devices.
How do I find a legitimate IID installer?
DMV’s IID Fast Facts page advises verifying the installer has a valid BAR or BHGS license.
BAR also publishes IID installation service information and standards.
What does DMV want as proof of IID installation?
DMV’s first-offender handout references proof of IID installation using form DL 920.
Do repeat offenders have to install an IID?
DMV’s statewide IID program page states repeat and injury-involved DUI offenders are required to install IID for 1–4 years depending on priors.
Do I still need SR-22 if I have an IID?
DMV materials show SR-22 proof of insurance as a reinstatement/restriction requirement in IID pathways.