BUI Attorney in Summerville, SC

The SC BUI Statute in Depth

S.C. Code § 50-21-112 defines the offense as operating a moving motorized water device or device under sail while impaired by alcohol, drugs, or a combination of the two. The drugs covered include legal and illegal substances alike, and a combination of a prescription drug and alcohol can satisfy the statute. One critical element is the word “moving.” The statute applies only to vessels in motion, so if a boat was anchored or docked at the time of the alleged offense, that fact may constitute a factual defense worth examining.

South Carolina doesn’t expressly ban open containers of alcohol on a boat, but the operator remains subject to both the 0.08% BAC presumption and the materially-and-appreciably-impaired standard. BAC readings between 0.05% and 0.08% carry no automatic legal presumption either way. The judge or jury weighs them as evidence. A reading below 0.05% creates a presumption the operator was not under the influence, though prosecutors can still attempt to prove impairment through other means.

The Afloat Test Battery & Evidentiary Challenges

When standard roadside sobriety tests can’t be administered on the water, officers use the Afloat Test Battery, a protocol developed for the marine environment. It includes the Horizontal Gaze Nystagmus test, which looks for involuntary eye movement associated with alcohol consumption, along with other seated assessments. Officers administering this battery are trained to NASBLA standards. There’s no statutory requirement in South Carolina to videotape a BUI suspect during field testing, so evidence in many cases comes down to the arresting officer’s written observations against the defendant’s account. A breathalyzer test, if administered, typically happens at the police station after arrest, not on the water. Breath test results, officer notes, any audio or video that exists, and witness statements can all be introduced at trial.

BUI Defense Strategies Under South Carolina Law

No two BUI cases present the same facts, and defense strategy depends on the specific circumstances of the stop, the arrest, and the testing that followed. Several avenues are worth evaluating in most cases.

Legality of the Stop or Boarding
Fourth Amendment protections apply on South Carolina waterways. If an officer exceeded the lawful scope of a safety inspection or conducted a search without proper authority, evidence obtained as a result may be inadmissible.

Vessel Movement
The BUI statute covers only moving watercraft. If the evidence shows the vessel was stationary at the time of the alleged offense, the statute may not apply.

Afloat Test Battery Results
These tests can be challenged on procedural and scientific grounds. Officer training, adherence to protocol, and the conditions under which testing occurred all matter.

BAC Evidence
Errors in how a breath test was administered, equipment calibration issues, or breaks in the chain of custody can provide grounds to challenge or suppress BAC results.

For first and second offense convictions, alternative sentencing options such as community service may be available in lieu of jail time, depending on the circumstances and the court.

Long-Term Consequences of a BUI Conviction

A BUI conviction in South Carolina results in a permanent criminal record that typically can’t be expunged. The collateral effects reach beyond the courtroom: difficulty passing background checks for employment, potential loss of professional licenses that require a clean record, increased insurance costs, and lasting reputational harm. Prior BUI convictions within a 10-year window are used to escalate any future charge to a higher offense tier, substantially increasing penalties. Even a first-offense misdemeanor requires mandatory ADSAP completion, which adds its own costs on top of court fines and legal fees. Acting quickly after an arrest, before suspension deadlines pass and before the state has a head start on building its case, can give your defense the best possible foundation.