Do You Have to Take a Field Sobriety Test in South Carolina?

KEY TAKEAWAYS:

In nearly every South Carolina traffic stop, field sobriety tests are voluntary, and refusing one does not trigger the automatic license suspension that comes with refusing a breath test. There is a narrow exception for drivers suspected of causing a fatal crash, who must submit to testing if physically able. Because these tests must be administered under strict, NHTSA-standardized procedures and recorded on video, a Charleston County DUI lawyer trained in the same protocol can often find grounds to challenge how or whether the test was properly conducted.

Blue lights fill your mirror, and soon after you've parked, an officer is asking you to step out and walk a straight line. Most drivers assume refusing is not an option. In reality, a field sobriety test in South Carolina is voluntary in nearly every situation, with one narrow exception every driver should know. At The Farmer Law Firm, our Charleston DUI lawyer knows exactly where that line falls and what defenses can work to fight the charges you face.

Can You Refuse to Take a Field Sobriety Test in South Carolina?

Yes, South Carolina law does not require drivers to perform roadside field sobriety tests such as the walk-and-turn or the one-leg stand. That's different from breath, blood, or urine testing, which falls under the state's implied consent law and carries real consequences for refusal. Understanding that distinction is an important thing to get right during a stop.

Field sobriety tests are investigative tools, not chemical tests. An officer can ask you to perform them, but you're free to decline, just as you can decline to say how much you drank. Declining does not carry the same penalty as refusing a breath test.

What Happens If You Refuse a Field Sobriety Test in South Carolina?

Refusing a field sobriety test won't automatically suspend your license the way refusing a breath test will. However, an officer can still use other evidence as grounds for an arrest, such as the following observations:

• Erratic driving 
• Odor of alcohol 
• Slurred speech
• Open alcohol containers in the vehicle

However, if you are later asked to take a breath test at the station and refuse, South Carolina's implied consent law will trigger an automatic license suspension.

Is There an Exception That Requires You to Submit to Testing?

Yes, but only in the most serious cases. If your stop did not involve a fatality, this exception almost certainly doesn't apply.

Under South Carolina Code Section 56-5-2948, when an investigating officer suspects a driver caused a motor vehicle crash resulting in another person's death, that driver must submit to field sobriety tests if physically able to do so. This narrow provision applies only to fatal-crash investigations, not routine stops. Outside it, the voluntary rule above still applies.

What Field Sobriety Tests Do South Carolina Officers Use?

Officers across South Carolina train on the same three NHTSA-validated tests, so recognizing them helps you understand what you're being asked to do. Each one targets a different sign of impairment, from eye movement to balance and divided attention.

• Horizontal Gaze Nystagmus, or HGN. The officer watches your eyes track a slowly moving object, looking for involuntary jerking.
• Walk-and-turn. You are required to take nine heel-to-toe steps along a line, a turn, and nine steps back.
• One-leg stand. This test requires you to balance on one foot while counting aloud for roughly 30 seconds.

These tests must be administered exactly in accordance with the NHTSA standardized field sobriety testing protocol. Wrong instructions, an unlevel surface, or a miscounted step can render the results unreliable, regardless of how you perform.

How South Carolina's Video Recording Law Protects You During Testing

South Carolina is one of the few states that requires DUI stops to be recorded on video from start to finish. That footage often becomes a vital piece of evidence in the case. Under Section 56-5-2953, the recording must begin no later than the officer's blue lights and must show:

• Any field sobriety tests administered
• The officer reading Miranda rights at the time of arrest
• The 20-minute observation period before a breath test, along with the driver being informed of the right to refuse

Because the video exists specifically to document compliance, gaps or inconsistencies in it are often more revealing than the test results themselves.

How a Charleston County DUI Lawyer Trained in Field Sobriety Testing Can Help You

Attorney Merritt Farmer is nationwide certified as an instructor in the NHTSA DUI Detection and Standardized Field Sobriety Testing course — the same course officers complete at the academy. That training matters when it is your DUI charge, your driver’s license, and your future on the line. Merritt can review the stop video, field sobriety tests, officer’s observations, and testing procedures against the standards officers are trained to follow, looking closely at whether what happened on the roadside matches what appears in the report. 

Just as important, our clients describe Merritt in their Google reviews and testimonials as someone who cares, treats people like family, provides the answers they need, and follows through. When you are facing a DUI and unsure what comes next, you deserve both a careful review of the evidence against you and a lawyer who takes the time to understand what the charge means for your life.