Can You Refuse a Field Sobriety Test in NC? Chemical Test Rules

Yes, you can refuse a field sobriety test in NC. These roadside exercises are voluntary, and no North Carolina statute penalizes you for declining them. Your license is not suspended for saying no, and no separate criminal charge attaches. The important caveat is that the chemical breath or blood test an officer asks for after arrest is a different test with different rules, and refusing that one does cost you your license. Drivers get into trouble when they confuse the two.

What a Field Sobriety Test Actually Is

Field sobriety tests are the physical and cognitive exercises an officer asks you to perform at the roadside before any arrest decision. The three standardized tests developed by the National Highway Traffic Safety Administration are the Horizontal Gaze Nystagmus, where an officer tracks your eye movement with a stimulus; the Walk-and-Turn, which asks for nine heel-to-toe steps along a line, a turn, and nine steps back; and the One-Leg Stand, which asks you to balance on one foot for roughly 30 seconds.¹ Officers use the results to build probable cause for a DWI arrest.

Nothing in North Carolina law requires you to perform these. You can politely decline. There is no automatic license suspension, no fine, no added criminal charge for the refusal itself.

What Happens If You Refuse at the Roadside

Refusing does not end the stop. An officer who already smells alcohol, hears slurred speech, or saw you weaving before the stop has evidence to work with. Those observations alone can supply enough probable cause for a DWI arrest, with or without your performance on the balance exercises.

Your refusal can also be used against you later. North Carolina law explicitly makes a field sobriety test refusal admissible in criminal, civil, or administrative proceedings.² A prosecutor can tell the jury you refused because you believed you would fail. Whether that argument lands depends on the rest of the case, but it is a factor the court is allowed to weigh.

So the honest picture of refusal is this: you avoid handing the officer additional evidence from the exercises themselves, but you do not escape the stop, and the refusal itself becomes a piece of the prosecution’s story if the case goes to trial.

The Roadside Breath Screening Is Not the Same Test

Between the voluntary coordination exercises and the post-arrest chemical test sits a middle category drivers often miss. Under G.S. 20-16.3, an officer can require you to blow into a small handheld breath device at the roadside, called an Alcosensor, if the officer has reasonable grounds to believe you consumed alcohol and either committed a moving violation or were involved in a crash. The officer can also require it if there is reasonable suspicion of an implied-consent offense during a lawful stop, including a license checkpoint.³

Refusing this handheld screening does not trigger the automatic license revocation that follows a post-arrest chemical test refusal. It is not consequence-free, though. The officer or a court can treat your refusal as evidence supporting reasonable grounds that you committed a DWI offense, which may make the arrest decision easier. The screening results themselves have limited use at trial; they can establish probable cause but generally cannot be introduced as direct evidence of your blood alcohol concentration.³ Blowing into the Alcosensor also does not satisfy the implied consent chemical test. If arrested, you will still face a separate chemical analysis at the station.

The Post-Arrest Chemical Test Is the One That Costs Your License

By driving on a North Carolina highway or public vehicular area, you automatically consent to a chemical analysis of your breath or blood if you are charged with an implied-consent offense, which covers DWI and related alcohol-involved driving offenses.⁴ Implied consent attaches after arrest, not at the roadside. This is the test, usually administered at the station or a hospital, that carries real license consequences for refusal.

Before administering it, the officer must inform you of your rights both orally and in writing, including notice that refusing will revoke your license for a year, that the officer can compel testing through other legal means, and that your refusal will be admissible at trial. You have the right to call an attorney and have a witness present, but neither can delay the test more than 30 minutes after you are notified of your rights.⁴

Refusing the chemical test triggers two back-to-back revocations. First, your license is immediately revoked for 30 days under G.S. 20-16.5.⁵ Then the Division of Motor Vehicles imposes a 12-month revocation that takes effect on the 30th calendar day after the DMV mails the revocation order.⁴ You are looking at roughly 13 months without full driving privileges.

These are civil penalties. They apply even if the DWI charge is later dismissed or you are acquitted. The refusal is the trigger, not the outcome of the criminal case. And the revocation sits on top of whatever sentence a DWI conviction might carry, so the consequences can stack. Your refusal is also admissible in court under G.S. 20-139.1, and prosecutors routinely frame it as consciousness of guilt.²

Refusing the Chemical Test Does Not Stop a Blood Draw

The implied consent statute warns that “an officer can compel you to be tested under other laws.”⁴ In practice, officers can seek a search warrant from a judge authorizing a blood draw. If the warrant is granted, hospital staff will draw your blood whether you consent or not.

The U.S. Supreme Court addressed this in Birchfield v. North Dakota, holding that the Fourth Amendment permits warrantless breath tests after a DWI arrest but requires a warrant for blood tests because blood draws are “significantly more intrusive.” States can impose civil penalties for refusing a blood test but cannot impose criminal penalties for that refusal.⁶ North Carolina’s revocation scheme is civil, so it remains in force.

The worst-case picture: you refuse, you still face the 12-month revocation, and the prosecution still has BAC evidence from a compelled blood draw to use against you at trial. The refusal added the license penalty without keeping the number out of the courtroom.

When a Refusal Counts as a “Willful Refusal”

The implied consent penalties apply only to a willful refusal, meaning you consciously chose not to take the test after being informed of the consequences.⁵ A genuine medical inability to provide a breath sample, or an officer’s failure to read the required warnings, can support an argument that the refusal was not willful. In day-to-day practice, officers document the advisement carefully and courts set a low bar for willfulness. Staying silent, stalling, or repeating “I want to talk to my lawyer first” past the 30-minute window generally counts as a refusal.

The bottom line for a driver thinking about the roadside tests: the walk-and-turn, one-leg stand, and eye-tracking test are yours to decline, and declining them carries no automatic license penalty. The decision that carries license consequences comes later, after an arrest, when the officer asks for a breath or blood sample under the implied consent law. Keeping those two decision points separate in your mind is the single most useful thing to take from this.

1
National Highway Traffic Safety Administration. DWI Detection and Standardized Field Sobriety Testing Participant Manual
2
Justia Law. North Carolina Code 20-139.1 – Procedures Governing Chemical Analyses; Admissibility
3
Justia Law. North Carolina Code 20-16.3 – Alcohol Screening Tests Required of Certain Drivers
4
North Carolina General Assembly. North Carolina Code 20-16.2 – Implied Consent to Chemical Analysis
5
North Carolina General Assembly. North Carolina Code 20-16.5 – Immediate Civil License Revocation for Certain Persons Charged With Implied-Consent Offenses
6
Justia US Supreme Court. Birchfield v. North Dakota