Why Do States Require Ignition Interlock Devices?

Over the past 15 years, more and more states have started using ignition interlock devices (IIDs) as a way to prevent drunk driving. These devices work similarly to a breathalyzer and are directly connected to a car’s ignition system.

Before the engine can start, the driver must blow into a mouthpiece to check their blood alcohol content (BAC). If the BAC is below the legal limit, the vehicle will start. However, if it's above, the device will block the ignition until the driver provides a clean test. This simple but effective measure helps ensure that only sober drivers get behind the wheel.

Some IIDs also require what’s called a “rolling retest.” After the car starts, the driver must blow again to confirm that no one else provided the initial sample. The device won’t stop the car immediately, but it will record the event and issue a warning. This data is then sent to the Department of Motor Vehicles for monitoring.

Every State Now Requires IIDs

By 2020, all U.S. states had laws in place requiring ignition interlock devices for DUI offenders. New Mexico was the first state to implement this policy in 2005, mandating IIDs for all convicted drunk drivers. Between 2006 and 2017, the state saw a significant drop in drunk driving incidents—over 70,000 cases were prevented thanks to these devices.

This success led other states to follow suit. While some states only require IIDs for repeat offenders, others like Connecticut have all-offender policies, meaning even first-time DUI offenders must install an IID. Studies show that all-offender states have seen greater reductions in drunk driving and related deaths. Today, 34 states and the District of Columbia have similar laws.

In Connecticut, IIDs aren't just for DUIs. They’re also required if you:

• Failed or refused a chemical alcohol test.
• Were found operating a vehicle under the influence of drugs.
• Caused vehicular assault or manslaughter.

Data Shows IIDs Work

The Centers for Disease Control and Prevention (CDC) reports that IIDs can reduce DUI offenses by up to 70%. However, the real challenge lies in ensuring that offenders actually install and maintain the device. Without consistent use, the effectiveness drops significantly.

Mothers Against Drunk Driving (MADD) has also studied the impact of IIDs. Their research found that these devices reduce repeat DUI offenses by 67%, lower drunk driving fatalities by 15%, and are the most reliable method for keeping impaired drivers off the road.

IIDs Are Often Required for a Hardship License

Many states offer hardship licenses to individuals with a DUI, allowing them limited driving privileges such as commuting to work or school. To qualify, drivers often need to install an IID before receiving these restricted licenses. This ensures that even those with limited access to a vehicle remain sober on the road.

Stricter Laws in Some States

Massachusetts is one state that has taken a tough stance on drunk driving. In 2005, the state passed Melanie’s Law, which increased penalties for DUI offenses and introduced an IID program for repeat offenders. The law also set stricter rules for license suspension and reinstatement.

Connecticut also requires IIDs for license reinstatement. Once a driver completes their suspension period and meets all requirements, they can get their license back—but only if an IID is installed. The driver must keep the device in place for a set period and pass regular maintenance checks.

What Else Do IIDs Track?

Beyond just measuring BAC, IIDs collect important data about the driver. For example, they track how many times a driver attempts to start the car, which can indicate whether they're trying to stay sober. Rolling tests can also capture GPS location data if the BAC is too high, adding another layer of accountability.

Some IIDs even come with cameras to make sure the right person is blowing into the device. However, this data isn’t always immediate. Drivers must bring their vehicles in for maintenance every 30 to 90 days. During these visits, the device is calibrated, and all stored data is sent to the DMV for review.

If a driver fails to maintain their IID, their device may be disabled, and their license suspension could be reinstated. This strict enforcement helps ensure compliance and keeps the roads safer.

Need help installing an ignition interlock device? After completing your DMV paperwork, contact DaSilva’s Auto Body to schedule an appointment today. Stay safe, stay sober, and drive responsibly.

Metal End Lid Caps Production Line

Metal End Lid Caps Production Line,aluminium cap production line,Easy Open Cap Production Line,Tin Can Lid End Production Line

Zhejiang Golden Eagle Food Machinery Co.,Ltd. , https://www.goldeneaglecanmaking.com