After a DUI, you may feel confused about what comes next. One frequently asked question is whether an ignition interlock device is necessary. In many states, the answer is yes.
These devices help keep drunk drivers off the road. But they also give you a second chance to drive again—legally and safely. Let’s look at what they are, how they work, and whether you’re required to install one.
Ignition Interlock Device: Is It Necessary?
An ignition interlock device (IID) is a small breathalyzer that connects to your car’s ignition system. Before the engine starts, you must blow into the device. If it detects alcohol, your car won’t start.
In most cases, you also have to take random “rolling tests” while driving. This makes sure you didn’t drink after starting the car.
So yes, it’s strict—but it’s also a tool that lets many drivers stay on the road.
Is an Ignition Interlock Device Required? Know Your State’s Law
Rules vary by state, but many now require an IID after:
- A first DUI offense, even without an accident
- A high BAC level (often 0.15% or higher)
- Repeat DUI convictions
- Refusing a breathalyzer test
Some states—like Arizona, New Mexico, and California—have mandatory IID laws even for first-time DUI offenders.
Other states leave it up to the judge. But don’t wait to be surprised in court. Check your local DMV or talk to a DUI lawyer as soon as you can.
Ignition Interlock Device Can Be the Only Way to Drive
In many cases, if your license is suspended, the only way to drive again is to install an IID.
You may qualify for a restricted license, but it usually comes with conditions:
- Install an IID on every vehicle you own or use
- Pay for monthly monitoring and calibration
- Show proof of installation to the DMV
- Complete DUI education programs
Without the device, you could remain off the road for months—or longer.
Ignition Interlock Device Costs: What You Need to Know
One downside is that IIDs aren’t free. You’re responsible for all costs, including:
- Installation: $70–$150
- Monthly monitoring: $60–$100
- Removal fee: $50 or more
Although it’s not cheap, driving legally again is often worth the price. Plus, staying compliant helps you avoid more penalties.
Are Ignition Interlock Devices Necessary? It’s Superior to the Other Option
Let’s be honest. Driving without a license or violating DUI rules can lead to
- Longer license suspensions
- Heavier fines
- Jail time
- Vehicle impoundment
Compared to those risks, using an IID is the smarter, safer choice. It shows the court you’re taking steps to change, and that can work in your favor later.
Also, many insurance companies view compliance as a positive sign, which may help keep your rates from rising too much.
What Are the Consequences of Non-Compliance?
If a judge orders you to install an IID and you don’t follow through, the penalties grow fast:
- Your license stays suspended
- You may be charged with a new crime
- Your probation could be revoked
- You might face jail time or extended restrictions
So, while the device may seem annoying, not having it could cost you much more.
Final Thoughts
So, do you need an ignition interlock device? If you’ve been convicted of DUI, there’s a good chance the answer is yes. These devices aren’t just required by law in many states—they also give you a way to regain your freedom.
Driving is a privilege, and after a DUI, it takes work to earn it back. An IID might feel like a punishment, but it’s a tool for progress. It helps you rebuild trust, follow the law, and stay safe on the road.
If you’re facing DUI charges or have already been convicted, speak to a DUI lawyer right away. The sooner you understand your obligations, the sooner you can take the right steps and move forward.
