South Carolina DUI Laws — Emma's Law, DUAC & First-Offense Rules

South Carolina DUI Laws Explained

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A South Carolina DUI arrest sets two legal processes in motion: a criminal case under S.C. Code § 56-5-2930 in magistrate or general sessions court, and an administrative license suspension under the SCDMV's implied consent statutes. Both timelines run independently, and South Carolina is unusual in offering a separate DUAC charge for a higher BAC range.

The legal threshold

  • Adults 21+: 0.08% BAC.
  • Drivers under 21: 0.02% BAC (zero tolerance).
  • Commercial drivers (CDL): 0.04% BAC while operating a commercial vehicle.
  • School bus drivers: 0.04% BAC.

South Carolina also recognizes impairment-only DUI under § 56-5-2930 — driving under the influence of alcohol, drugs, or any combination of the two to the extent that faculties are "materially and appreciably impaired." A 0.05% BAC or higher creates an inference of impairment, but the inference can be rebutted in court.

DUAC: the 0.16% charge

South Carolina is one of the few states with a separate, distinct charge for high-BAC driving: Driving with an Unlawful Alcohol Concentration (DUAC) under § 56-5-2933. DUAC applies when:

  • 0.08-0.099% BAC — DUAC first offense, $400 fine + assessment, 6-month suspension.
  • 0.10-0.159% BAC — DUAC standard, increased fine and longer suspension.
  • 0.16% or higher BAC — DUAC enhanced, mandatory IID under Emma's Law, longer license suspension, and longer minimum jail time.

The same conduct can be charged as DUI or DUAC — DUAC is a per-se offense based purely on the BAC reading, while DUI requires evidence of impairment plus the BAC. Prosecutors choose the charge that fits the evidence.

Implied consent and refusal

Driving in South Carolina is deemed consent to a chemical breath, blood, or urine test if requested by an officer with probable cause. Refusing the test triggers an automatic six-month administrative suspension for a first refusal, separate from any criminal conviction. The driver has 30 days to request an administrative hearing with the SCDMV's Office of Motor Vehicle Hearings to contest the refusal suspension.

First-offense penalties (criminal)

A first South Carolina DUI conviction at 0.08-0.099% BAC typically produces:

  • 48 hours to 30 days in jail (or 48 hours of public service in lieu of jail on first offense).
  • A base fine of $400 plus $100 assessment, plus court costs.
  • A six-month license suspension.
  • Mandatory completion of the Alcohol and Drug Safety Action Program (ADSAP).
  • SR-22 insurance filing for three years — see SC car insurance.
  • A reinstatement fee at the SCDMV — see SC reinstatement.

Penalties scale up for higher BAC at conviction — fines reach $500-$1,000 at 0.10-0.159% and $1,000-$1,500 at 0.16% or higher, with longer suspension and longer mandatory IID under Emma's Law.

Emma's Law and ignition interlock

Since 2014, South Carolina has required ignition interlock devices (IIDs) for nearly every DUI conviction under Emma's Law (§ 56-5-2941). The IID requirement applies to:

  • Every DUI first offense with a BAC of 0.15% or higher.
  • Every refusal-to-test conviction.
  • Every second or subsequent DUI conviction.

The IID period is six months for a first offense (high BAC), 24 months for a third offense, and longer for repeat offenders. The device is installed at the driver's expense — typically $70-$150 per month plus an installation fee. Failed tests, missed calibrations, or tampering can extend the IID period.

Aggravating factors

Penalties escalate quickly when any of these apply:

  • BAC of 0.16% or higher.
  • An accident involving great bodily injury — separate felony of Felony DUI.
  • An accident involving death — separate felony of Felony DUI Resulting in Death, with 1-25 years prison.
  • A child under 16 in the vehicle — separate child endangerment charge.
  • Driving on a suspended or revoked license at the time of the DUI.

Repeat offenses

South Carolina has a 10-year lookback for prior DUI offenses. A second DUI within 10 years brings:

  • 5 days to 1 year in jail (mandatory minimum 48 hours actually served).
  • $2,100-$5,100 fine.
  • 1-year license suspension and 2-year IID requirement.
  • Longer ADSAP requirements.

A third DUI within 10 years is a felony with 60 days to 5 years prison, $3,800-$6,300 fines, and a 2-year license revocation. A fourth within 10 years carries 1-7 years prison and lifetime IID. See SC point system for how DUI convictions interact with the broader points framework.

For a national perspective, see our national DUI guide.

Official sources

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