Guide and troubleshooting

Can Someone Else Drive Your Car With Ignition Interlock? Read to Know

Written by Autofot
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Ignition Interlock Device (IID) is a breathalyzer-like device that prevents drivers from starting their vehicles until they blow into the IID. This device has become mandatory in some states, such as California and New York, and is considered an excellent way to prevent drunk driving.

This device was designed to deter intoxicated drivers from operating motorized vehicles. It measures blood alcohol concentration (BAC) and stops the car if the BAC level rises above a certain threshold. The machine also records each driver’s ID, date of birth, gender, height, weight, and license plate number.

Can Someone Else Drive Your Car With Ignition Interlock?

Can Someone Else Drive Your Car With Ignition Interlock

You can let someone else drive your vehicle with an ignition interlock device. However, there are several things you should know before doing so.

  • First, the vehicle needs to be equipped with an ignition interlock system. Second, the vehicle operating must pass a background screening, complete training, and obtain certification. Third, the person must have a clean record.
  • It’s important to note that ignition interlock systems cannot detect impairment caused by prescription medications. Therefore, you should still refrain from using these drugs while driving.
  • Finally, it’s illegal to operate a motor vehicle under the influence of any drug or medication unless you have a medical exemption certificate.

Many states require drivers who have had their license revoked due to alcohol or drug offenses to install an ignition interlock device before they’re allowed to get behind the wheel. You can’t even take a test drive without blowing into a breathalyzer first.

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But there are some exceptions. For example, if you’ve already completed a DUI treatment program, you don’t need to have an ignition interlock installed. If you plan to apply for a restricted driving permit, you also won’t need an ignition interlock because the state will issue you a temporary license.

How An Ignition Car Interlock Works

Can Someone Else Drive Your Car With Ignition Interlock

An ignition interlock device typically consists of two parts:

1. An electronic breath analyzer and

2. A wireless transmitter.

If a driver blows into the breath analyzer, it sends a signal to the transmitter, which relays the information to law enforcement officers. The law enforcement officer verifies whether the person was drunk driving by checking the results of the breath test against a database of previous tests taken by the same individual. If the officer determines that the person was impaired, they may issue a citation and impound the vehicle.

Some states allow a third party such as a friend or relative to operate the vehicle if the owner has had their license suspended due to a DUI conviction. This option allows the owner to avoid jail time and the cost associated with owning and maintaining a vehicle.

In addition, ignition interlocks are valuable tools for preventing repeat offenders from reoffending. An ignition interlock system prevents repeat offenders from driving after consuming alcohol. Repeat offenders often continue to drink and drive despite a breathalyzer.

A recent study published in the Journal of Studies on Alcohol and Drugs found that ignition interlock systems reduced recidivism among individuals convicted of DWI. Specifically, those who used an ignition interlock device were much less likely to return to court for another offense within six years than those without one.


In conclusion, if someone else is driving behind you and their vehicle has an ignition interlock device, you should have no problem letting them take the wheel. Ignition interlocks prevent drivers from starting their cars without first blowing into a breathalyzer or swiping their license through the machine. They’re required by law in California, Washington State, New York, and Arizona (among others) and can be installed in any vehicle with a manual transmission.


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About the author


Autofot is a website that blogs on the importance of taking good care of our automobiles. Little things that are ignored matter the most, hence we try to educate car owners and other different auto owners on how to go about taking care of their cars with little or no cost.

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