South Carolina’s All-Offender Interlock Law: Why Even a First DUI Now Means an Ignition Interlock — and What It Costs

DUI Defense — North Charleston, SC

Do you need an ignition interlock for a first DUI in SC? As of May 19, 2024, yes. Under Act 55 of 2023 (Senate Bill 36), South Carolina is now an “all-offender” interlock state — an ignition interlock device is required for nearly every DUI or DUAC conviction to regain driving privileges, including a first offense with a BAC under 0.15 (§ 56-5-2941). Most online answers still cite the old rule.

Updated July 2026 · ~9 min read

Key points

• South Carolina changed the rule on May 19, 2024. The old standard — interlock only for repeat offenders or a first offense at 0.15+ BAC — is gone.
• A first offense now generally requires the device for 6 months; the requirement scales up sharply with priors.
• The costs are yours to pay — installing, monitoring, and later removing the device — and because private, state-approved vendors set the prices, you should get a current quote rather than rely on any figure online.
• The interlock route ties into a separate license track (the Temporary Alcohol License and the Ignition Interlock Restricted License).
• A DUI charge can still be fought. South Carolina’s § 56-5-2953 video rule and cases like City of Rock Hill v. Suchenski remain live defenses — with an important 2022 limit you should understand.

If you have just been arrested for a DUI in North Charleston or anywhere in the Charleston Lowcountry, you have probably searched for the answer to one basic question: will I have to put a breathalyzer in my car? For years, the honest answer for a low-BAC first offender was “probably not.” That answer is now wrong. South Carolina rewrote the rule in 2024, and because the change is so recent, most websites — and most AI answers — still tell you the old, outdated version. Here is what the law actually says today, what it costs, how it affects your license, and how a DUI charge can still be challenged.

This article is general legal information, not legal advice.

What Changed in May 2024: From High-BAC-Only to All Offenders

For a decade, South Carolina’s interlock rule came from “Emma’s Law” (Act 158 of 2014). Under that law, an ignition interlock device (IID) was mandatory only for repeat DUI offenders or for a first-time offender who blew a 0.15 BAC or higher. If you had a first offense with a BAC under 0.15, you could typically serve a finite suspension and get your license back without ever installing a device.

That framework was replaced by Act 55 of 2023 (Senate Bill 36), which became fully effective on May 19, 2024. Act 55 amended South Carolina Code § 56-5-2941 to make the state an “all-offender” interlock jurisdiction. In plain terms: an IID is now required for essentially all DUI and DUAC convictions in order to regain lawful driving privileges — and § 56-5-2941 expressly includes a first offense with a BAC under 0.15.

An ignition interlock device is now mandatory for nearly all DUI/DUAC convictions in South Carolina, including a first offense under 0.15 BAC, to regain driving privileges. — § 56-5-2941 (law.justia.com)

The program is run by the South Carolina Department of Probation, Parole and Pardon Services (SCDPPPS). The device requires a clean breath sample before the vehicle will start, and it is calibrated to block the ignition at a BAC of 0.02 or higher.

Why so many answers are still wrong. Because Act 55 is so new, a large share of online resources, older legal blogs, and AI-generated summaries still describe the pre-2024 Emma’s Law standard. They repeat some version of “you only need an interlock for a repeat DUI or a first offense at 0.15 or higher.” As of May 19, 2024, that advice is simply out of date. If you are relying on it in the Charleston area’s 9th Judicial Circuit, you are relying on a rule that no longer exists.

The Real Costs: Installation, Monthly Fees, and Program Length by Offense

Two things drive the burden of the interlock program: how long you must keep the device, and what it costs. The offender pays for the program.

How long you keep the device

Under § 56-5-2941, the required duration scales with the number of prior offenses:

• First offense: 6 months of interlock.
• Second offense: 2 years.
• Third offense: 3 years (extended to 4 years if the third offense occurs within 5 years of the first).
• Fourth or subsequent offense: a lifetime requirement.

These are the statutory IID periods under § 56-5-2941.

What it costs

There is an important point that surprises most people: there is no single, fixed statutory price for the interlock device. South Carolina uses private, state-approved vendors to lease and service the hardware, and the offender pays those costs. In practice, that means recurring, out-of-pocket charges — for putting the device in, for keeping it maintained and monitored, and for taking it out at the end.

Because vendors set their own prices and those prices change over time, we do not quote a specific dollar figure here — the honest answer is that the real number depends on which approved vendor you use and when. Get a current, written quote from a state-approved vendor before you budget, and ask what every line item covers.

Interlock lease and installation prices are set by private, state-approved vendors and change over time. Confirm current pricing directly with a vendor rather than relying on any figure you find online.

If you are worried about the cost, ask SCDPPPS or your attorney whether any financial-assistance option applies to your situation, and what documentation it would require — those specifics are set by the program and can change, so confirm them directly before you rely on them.

ADSAP is a separate, capped cost

Separately from the interlock, the Alcohol and Drug Safety Action Program (ADSAP) is a mandatory prerequisite for reinstating your license after any DUI or DUAC conviction (§ 56-5-2951). By statute, ADSAP charges are capped at roughly $500 for education and $2,000 for treatment, not to exceed $2,500 total. Failing to enroll on time or to make satisfactory progress can suspend your restricted driving privileges until the program is finished.

How the Interlock Route Interacts With Temporary and Route-Restricted Licenses

South Carolina runs a “two-track” system after a DUI arrest. Your license faces consequences from the SCDMV’s administrative process that are separate from what happens in criminal court. Understanding how the interlock fits into that track matters, because the 2024 law changed your options.

Refusal, the implied-consent suspension, and the 30-day window

Under South Carolina’s implied-consent law (§ 56-5-2950), driving on state roads means you have agreed to chemical testing if you are lawfully arrested for DUI. If you refuse the breath test, or if you submit and register a BAC of 0.15 or higher, the officer issues an immediate Notice of Suspension.

You then have 30 days to request a contested-case hearing before the Office of Motor Vehicle Hearings (OMVH). The refusal suspension lengths are set by § 56-5-2951 and scale with prior offenses; because this scheme was affected by the 2024 changes, the exact current suspension length for your situation should be confirmed against the live statute or with an attorney rather than assumed from an older chart.

The Temporary Alcohol License (TAL)

When you properly request the OMVH hearing, you are generally eligible for a Temporary Alcohol License (TAL). The TAL lets you keep driving while you wait for the hearing outcome — it effectively stays the administrative suspension in the meantime.

The Ignition Interlock Restricted License (IIRL)

Here is where the all-offender law reshaped the old playbook. In the past, drivers often sought a route-restricted or provisional license to drive to work or school during a suspension. Now that South Carolina is an all-offender interlock state, the interlock is central to how people regain driving privileges after a DUI-related suspension — and the device-free restricted-license options that used to exist are more limited. In practice, the route back to lawful driving typically involves getting the interlock installed and obtaining an Ignition Interlock Restricted License (IIRL) for the required period.

The exact license mechanics — how the temporary license, the hard suspension, and the IIRL fit together in your specific case — were affected by the 2024 changes and can turn on your facts. Confirm the current step-by-step process with the SCDMV or a local attorney rather than assuming it from an older explainer or an AI answer.

North Charleston also physically straddles Charleston and Dorchester counties, so which county and circuit your case lands in can affect the court and SCDMV logistics — another reason to confirm the specifics locally.

Fighting the Underlying Charge: Video Rules, Suchenski Dismissals, and Plea Alternatives

An interlock requirement most commonly follows a conviction — but, as the license section above explains, a driver who loses the separate administrative (implied-consent) track may also have to enter the interlock program to drive lawfully during a suspension. Either way, the charge itself can be challenged before it gets to that point, and South Carolina gives DUI defendants an unusually strong procedural tool.

The § 56-5-2953 video requirement

South Carolina Code § 56-5-2953 requires law enforcement to video-record a DUI/DUAC arrest at two places: the incident site (the roadside) and the breath-test site.

• At the incident site, the recording must begin no later than when the officer activates the blue lights, and it must capture any field sobriety tests, the arrest, and the reading of Miranda rights.
• At the breath-test site, the recording must show that the person is being recorded, the notice of the right to refuse, the mandatory 20-minute pre-test observation period, and the actual taking or refusal of the test.

The statute allows only four narrow exceptions under § 56-5-2953(B), each of which requires the officer to file a sworn affidavit — for example, that the equipment was inoperable despite reasonable maintenance, that recording was physically impossible because of a medical emergency or exigent circumstances, or another valid reason under the totality of the circumstances.

Suchenski dismissals — and the important 2022 limit

For years, the controlling case was City of Rock Hill v. Suchenski, 374 S.C. 12, 646 S.E.2d 879 (2007). Under Suchenski, an inexcusable failure to record the required parts of the stop — where no statutory exception applies — can require dismissal of the DUI charge, and the defense does not have to prove it was prejudiced by the missing video.

But you should not rely on the stale, over-broad version of this rule that still circulates online. In State v. Taylor, 436 S.C. 28 (2022), the South Carolina Supreme Court narrowed the remedy for one specific failure: not recording the Miranda warning. The Court held that failing to record Miranda no longer means automatic dismissal — instead, the remedy is suppression of the statements the defendant made, not dismissal of the whole case.

The distinction is the part most online answers get wrong:

• Failure to record the stop, the field sobriety tests, or the arrest can still support dismissal under Suchenski.
• Failure to record the Miranda warning now generally means the statements are suppressed, not that the case is dismissed, under Taylor.

For example, an attorney reviewing your case will look closely at whether the blue-light activation, the field sobriety tests, and the arrest were properly captured on video, and whether any claimed exception is backed by a valid affidavit.

What about DUAC, PTI, and expungement?

A few more points frequently get stated incorrectly:

• DUI vs. DUAC. DUI (§ 56-5-2930) requires the State to prove your faculties were “materially and appreciably impaired.” DUAC (§ 56-5-2933) is a per-se offense requiring only a BAC of 0.08 or higher, with no need to prove impairment. The two are mutually exclusive for a single incident — a driver is prosecuted under one or the other, and cannot be convicted of both.
• Pretrial Intervention (PTI). DUI and DUAC are statutorily ineligible for PTI under § 17-22-50. You cannot divert a DUI into PTI to make it disappear.
• Expungement. A DUI or DUAC conviction is never expungeable in South Carolina (§ 22-5-910). It stays on your record permanently. Do not assume a clean record afterward will erase it.
• Plea alternatives. Because a conviction triggers the interlock, ADSAP, and permanent record consequences, the analysis of the video, the stop, and the testing often shapes whether a case is fought, negotiated, or resolved another way. No specific result — including a dismissal or a particular plea — can be promised in advance.

A note on pending legislation

You may see references to Bill 52, a 2025–2026 DUI reform package. As of mid-2026, it remains pending in a conference committee and is not law. Among other things, it proposes raising DUI penalties, adding victim-impact panel requirements, and allowing “substantial compliance” with the video statute in place of strict per-se dismissals — but until it is enacted, the current rules described above still control. Do not treat proposed bills as if they were already the law.

Frequently Asked Questions

Do I really need an interlock for a first-offense DUI in South Carolina? Yes, in nearly all cases. Since May 19, 2024, Act 55 made South Carolina an all-offender state, so an ignition interlock is required to regain driving privileges after nearly any DUI or DUAC conviction — including a first offense with a BAC under 0.15 (§ 56-5-2941).

How long does the interlock stay on for a first offense? For a first offense, the statutory period is generally 6 months. It rises to 2 years for a second offense, 3 years for a third (4 years if within 5 years of the first), and a lifetime requirement for a fourth or subsequent offense.

How much does the interlock cost? The offender pays, and there is no single fixed statutory price. Costs are recurring and out-of-pocket — installing the device, keeping it maintained and monitored, and removing it at the end — and because private, state-approved vendors set those prices and they change over time, we do not quote a figure. Get a current written quote from an approved vendor, and ask SCDPPPS or your attorney whether any financial-assistance option applies to your situation.

Can I still drive while my case is pending? Often yes. If you request the OMVH hearing within 30 days, you are generally eligible for a Temporary Alcohol License that lets you keep driving while you await the outcome. If the suspension later takes hard effect, the interlock route (an Ignition Interlock Restricted License) is generally the path to lawful driving.

Can a DUI be dismissed if the video is missing? Sometimes. Under City of Rock Hill v. Suchenski, an inexcusable failure to record the stop, field sobriety tests, or arrest can require dismissal. But under State v. Taylor (2022), a failure to record only the Miranda warning results in suppression of statements, not automatic dismissal. Every case turns on its facts.

Can I get a DUI expunged later if I stay out of trouble? No. DUI and DUAC convictions are never expungeable in South Carolina (§ 22-5-910) and remain on your record permanently.

Charged With a DUI in North Charleston? Understand Your Options Before You Decide Anything

A first-offense DUI in South Carolina now carries consequences that reach well past a single court date — the interlock, ADSAP, a permanent record, and a separate fight over your license. The good news is that a charge is not a conviction, and the process has real checkpoints: the lawfulness of the stop, the field sobriety tests, the breath test, and whether the arrest was recorded in compliance with § 56-5-2953.

North Charleston DUI lawyer Rad S. Deaton and Deaton Law Firm, LLC help people across the Charleston Lowcountry understand exactly what they are facing and examine every available defense — without ever promising an outcome. If you have questions about your situation, we offer a free consultation. Call (843) 225-5723 or reach out through our contact page.

Learn more about how we handle these cases on our DUI defense and criminal defense pages, or read our related explainer on North Charleston DUI penalties and defense. You can also learn more about attorney Rad Deaton.

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This article is general legal information, not legal advice, and does not create an attorney-client relationship. Laws change and every case turns on its facts. Consult a licensed South Carolina attorney about your situation. (Attorney advertising — SC Rules of Professional Conduct 7.1–7.2.)