If you are charged with a DWI in Virginia, you may hear the term “ignition interlock.” This article explains what an ignition interlock device is and how it works.

What Is an Ignition Interlock Device?

An ignition interlock device is a small breath-testing machine that is installed in your car.
It is connected to your vehicle’s starter.

If the device detects alcohol on your breath, the car will not start and it will be reported.

How Does an Ignition Interlock Device Work?

Using an ignition interlock device is like taking a breath test every time you drive.

Here’s how it works:

1. You blow into the mouthpiece before starting your car
2. The device checks for alcohol
3. If no alcohol is detected, your car starts
4. If alcohol is detected, your car will not start

While you are driving, the device may also ask for rolling retests. This means you must blow again while the car is running.

Important:

• You cannot have someone else blow for you
• Missed tests or failed tests are recorded
• Violations can lead to revocation of your restricted license, longer restrictions or new charges.

How Long Do I Have to Have Ignition Interlock Installed?

If you are convicted of first DWI offense in Virginia, and you have been granted a restricted license, you will be required to have ignition interlock installed for 12 months if there are no other limitations on your restricted license.  However, if there are other limitations on your restricted license, you may request that the period be reduced to 6 months.

How Much Does Ignition Interlock Cost?

There are fees associated with Ignition Interlock.  While costs vary, the following are ranges of prices:

• Installation fee ($65-$130)
• Monthly monitoring fee ($50-$100)