If you’ve been following DUI laws in South Carolina over the past few years, you know they’ve been getting tougher. One of the biggest changes came with the expansion of the Ignition Interlock Device (IID) Program, and in 2025, it’s more important than ever to understand how it works.

At Coastal Law, we help clients throughout South Carolina navigate the DUI process, protect their rights, and fight for the best outcome possible. 

Here’s a breakdown of the current law, what’s changed, and how it may impact you if you’re facing a DUI charge.

What Is the Ignition Interlock Device Program?

The Ignition Interlock Device (IID) is a small breathalyzer installed in your car. Before you can start the vehicle, you have to blow into the device. If it detects alcohol, your car won’t start.

South Carolina law — specifically S.C. Code Ann. § 56-5-2941 — requires certain drivers convicted of DUI or DUAC (driving with an unlawful alcohol concentration) to install an IID at their own expense. The device must stay in the vehicle for a specific period of time, depending on the offense.

The Biggest Change: Expansion of IID Requirements

In the past, IID requirements mainly applied to drivers with repeat offenses or those convicted with a blood alcohol concentration (BAC) of 0.15% or higher. But thanks to changes in the law:

• First-time offenders with a BAC of 0.15% or higher must now enroll in the IID program if they want to keep driving.
• Drivers who refuse a breathalyzer test during a DUI stop face an automatic license suspension but can request an IID to regain limited driving privileges.
• IID participation is also mandatory for anyone convicted of DUI with prior offenses.

In short, the IID is no longer just for “serious” or repeat cases. Now, even a first offense can land you in the program.

How Long Do You Have to Use an IID in South Carolina?

The length of time you’ll have an IID depends on your conviction:

• First DUI offense (BAC 0.15% or higher): 6 months minimum
• Second DUI offense: 2 years
• Third DUI offense: 3 years
• Fourth or subsequent DUI: Permanent IID requirement

On top of that, the clock only runs while you have the device installed and are actively using it. If you don’t install it, you won’t regain your license.

Costs of the IID Program

One of the toughest aspects of the IID program is the cost. Drivers are responsible for:

• Installation fees
• Monthly maintenance fees
• Removal fees once the program is complete

These costs can add up quickly — often several hundred dollars over the course of the program. For many people, that financial burden is almost as stressful as the DUI itself.

What This Means If You’re Charged with DUI

Being charged with DUI in South Carolina doesn’t automatically mean you’ll be convicted. You still have the right to challenge the stop, the breath test, and the evidence against you.

A DUI defense lawyer can:

• Challenge whether the traffic stop was legal
• Question the accuracy of breathalyzer or blood test results
• Help you request an administrative hearing to fight license suspension
• Negotiate for reduced charges or alternative sentencing

At Coastal Law, our attorneys regularly defend clients against DUI charges and help them avoid unnecessary penalties, including mandatory IID installation.

FAQ: South Carolina DUI and Ignition Interlock Device

Q: Can I refuse the Ignition Interlock Device in South Carolina?

A: You can refuse, but you’ll lose your driving privileges. The IID is the only way to legally keep driving after a qualifying DUI conviction or refusal.

Q: Does every first-time DUI require an IID?

A: Not every first-time DUI — only those with a BAC of 0.15% or higher or those who refuse the breath test.

Q: How much does the IID cost?

A: Costs vary, but expect installation and monthly fees. It often totals several hundred dollars.

Q: Can Coastal Law help me avoid an IID?

A: Yes. If your DUI case is dismissed, reduced, or successfully challenged, you may avoid IID requirements. That’s why having a defense lawyer matters.

Final Thoughts

The expansion of the Ignition Interlock Device Program shows how serious South Carolina is about cracking down on drunk driving. But being charged with DUI doesn’t mean you’re out of options.

If you’re facing a DUI in Myrtle Beach or anywhere in South Carolina, the attorneys at Coastal Law can help. We’ll walk you through your rights, fight your charges, and work to keep your license — and your future — on track.

📞 Contact Coastal Law today for a consultation if you’ve been charged with DUI in South Carolina.