Loading...
Loading...
After a DUI in South Carolina, you'll likely need an ignition interlock device to drive legally. Here's what you need to know about requirements, costs, providers, and how to complete your IID period without violations.
6-12 mo
1st Offense
Typical duration
1-3 years
2nd+ Offense
Enhanced requirement
$70-150
Monthly Cost
Average range
IID requirements can vary by county and judge. Always confirm your specific requirements with your court order or South Carolina DMV.
If you've recently been arrested for Driving Under the Influence (DUI) in South Carolina, understanding the Ignition Interlock Device (IID) requirements is crucial. This article provides a comprehensive overview of the IID program, including the laws, procedures, costs, and compliance measures you'll need to know.
An Ignition Interlock Device (IID) is a breath-alcohol analyzer connected to a vehicle's ignition system. Before you can start the car, you must blow into the device. If the device detects alcohol above a pre-set limit (typically 0.02% BAC), the car will not start. IIDs also require rolling retests while the vehicle is in operation. In South Carolina, all IIDs are required to have a camera that takes a photo of the driver when providing a breath sample.
South Carolina's "All Offender Law," effective May 19, 2024, mandates that all individuals convicted of DUI, regardless of their Blood Alcohol Content (BAC) at the time of arrest, must participate in the IID Program to restore their driving privileges. Prior to this law, first-time offenders with a BAC below 0.15% could sometimes avoid the IID requirement.
The primary statute governing the IID Program is South Carolina Code Section 56-5-2941. This statute, along with Section 56-1-400 (regarding driver licensing) and Section 56-5-2950 (regarding implied consent), establishes the legal framework for the program.
The length of time you are required to have an IID installed depends on the specifics of your offense. The minimum statutory periods are prescribed by Section 56-5-2990 and Section 56-5-2945. Actual removal is contingent upon successful completion of the program without violations, so the practical duration can be longer.
South Carolina utilizes private companies to lease, install, and service IIDs. As of the current fiscal year, the approved providers are:
The financial burden falls almost entirely on the offender. Costs include:
Total Estimated First-Year Liability: $1,300 - $1,700. This excludes increases in auto insurance premiums (SR-22), court fines, or legal fees.
South Carolina enforces compliance through the Ignition Interlock Device Point System, managed by the South Carolina Department of Probation, Parole and Pardon Services (SCDPPPS). This is separate from standard driver's license points.
**Violation Matrix:*| Violation (Points) | Consequence | | :----------------- | :------------------------------------------------------------------------------------------ | | 2.0 to 2.5 Points | IID requirement extended by 2 months. | | 3.0 to 3.5 Points | IID requirement extended by 4 months. Mandatory substance abuse assessment (DAODAS). | | 4.0 Points or More | Suspension of the "II" Restricted License for 6 months. Mandatory substance abuse treatment. |
Offenders have a limited right to appeal point assessments within 15 days of the notice (30 days for 4+ point suspensions).
Possessing a functioning IID alone is not enough to legally operate a vehicle. You must obtain an Ignition Interlock Restricted License ("II" License) from the SCDMV. Driving a vehicle with an IID while holding a suspended license (or no license) remains a serious criminal offense.
To reinstate your license fully after the IID period:
Only after obtaining the unrestricted license should the IID be removed.
If you are arrested for DUI, refusing a breath test results in a 6-month administrative suspension, and a BAC ≥ 0.15% results in a 1-month suspension, separate from the criminal DUI trial. Under Section 56-1-286 and Section 56-5-2951, you can choose to "End the Suspension" by voluntarily enrolling in the IID Program. This allows you to obtain an "II" license immediately instead of serving the "hard" suspension, but you waive your right to contest the implied consent suspension.
All of these are criminal misdemeanors potentially resulting in fines and/or jail time.
This information is intended as a guide and does not constitute legal advice. Consult with an attorney to discuss the specifics of your case.
South Carolina requires ignition interlock devices in most DUI cases. Here's a breakdown by offense level.
| Offense Type | IID Required | Duration | Notes |
|---|---|---|---|
| 1st DUI (BAC < 0.15) | 6-12 months | May be required or optional depending on court | |
| 1st DUI (BAC 0.15+) | 12-18 months | Mandatory for high BAC | |
| 2nd DUI | 1-2 years | Always mandatory | |
| 3rd+ DUI | 2-5 years | Extended requirement, possible permanent | |
| Refusal to Test | 12-24 months | Mandatory in most states |
* Durations are typical ranges. Judges may impose longer requirements. South Carolina uses a 10-year lookback period for prior offenses.
Under certain conditions, you may be able to drive an employer-owned vehicle without an interlock. Requirements typically include:
Employer exemptions are being phased out in many states and may have been modified since this page was updated. Verify current South Carolina law with the DMV or your attorney before driving any vehicle without an interlock. Violations can result in criminal charges.
These providers are approved by the state and have installation locations throughout the area. Compare costs and services before choosing.
| Provider | Locations | Coverage | Get Quote |
|---|---|---|---|
| Intoxalock | 4,500+ nationwide | South Carolina approved | Compare |
| Smart Start | 2,200+ nationwide | South Carolina approved | Compare |
| LifeSafer | 1,700+ nationwide | South Carolina approved | Compare |
Links marked with "Compare" may be affiliate links. We may earn a commission at no additional cost to you.
Follow these steps to get your IID installed and start driving legally.
After your DUI conviction or administrative suspension, you'll receive documentation specifying your IID requirement duration and any conditions.
South Carolina requires you to use a state-certified IID provider. Major providers include Intoxalock, Smart Start, and LifeSafer, all with locations in South Carolina.
Installation typically takes 1-2 hours. Bring your court order, drivers license, vehicle registration, and payment. The technician will wire the device into your vehicle.
The technician will train you on proper blow technique, rolling retests, and what triggers a violation. Most failures are due to improper technique, not actual alcohol.
Return to the service center every 30-60 days for calibration. Missing a calibration appointment is a violation that can extend your requirement.
Once your IID period is complete, get documentation from your provider and the court/DMV. Don't remove the device until you have official authorization.
Often included in monthly fee
Charged for failed tests or missed calibrations
Varies by provider and duration
Common issues and how to handle them
Information sourced from South Carolina DMV, state statutes, and IID provider documentation. Always verify current requirements with official sources.
Verification: Requirements verified against South Carolina DMV and state statute standards for March 2026. Laws and requirements can change—always confirm current rules with your local DMV office.
Last updated: January 2026
An experienced DUI attorney can help you understand your IID requirements, potentially reduce your interlock period, or address violations.
Disclosure: This page contains affiliate links to IID providers. We may earn a commission if you install through our partners, at no additional cost to you. This helps support our free educational content.