Ignition Interlock Devices in South Carolina

When is an IID Authorized?

South Carolina has authorized the use of ignition interlock devices (IIDs) for certain drivers convicted of alcohol related driving offenses.

When are IIDs Authorized?

Effective January 1, 2009, an IID restriction is required for persons who are convicted of a second or subsequent offense for the following violations:

  • driving under the influence of alcohol or drugs,
  • driving with an unlawful alcohol concentration, or
  • causing great bodily injury or death while driving under the influence of alcohol or drugs.. 

 What’s an IID?

An IID connects to the vehicle dashboard and the driver breaths into the device prior to starting the vehicle. If the IID detects a BAC above the limit programmed the device (typically calibrated at .02%), then the engine won’t start. Read more about ignition interlock devices (IIDs).

Where Can I Find an IID Provider?

IID providers are approved for installation throughout South Carolina. You can learn more about IID rules at the South Carolina DMV website: https://www.dppps.sc.gov/Ignition-Interlock.

Who Pays For it?

In almost all cases the driver who has been convicted of a DUI/DWI pays for the installation and lease of the ignition interlock system. You can expect to pay up to $100 for installation (although some companies offer free installation) and between $75-$120 per month for the lease. This is a rough estimate and your price may be higher or lower depending on your location.


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