Can You Refuse a Sobriety Test in Texas?

Red and blue lights in the rearview mirror have a way of making every decision feel high-stakes, and few moments are more confusing than an officer asking you to step out of the car and walk a straight line, or to blow into a handheld device.

Texas drivers often lump both requests together under one vague idea of a “sobriety test,” but Texas law treats roadside coordination exercises and chemical breath or blood tests as two completely separate categories, governed by two completely different sets of rules. 

As a former State District Court Judge and Chief Prosecutor, E.R. “Ned” Turnbull has spent 25+ years seeing this exact question from every angle — both as the prosecutor building a case around a driver's refusal, and as the judge deciding whether that refusal was even admissible at trial. This guide breaks down exactly what you can refuse, what happens when you do, and how that decision plays out from the moment the lights come on to the day your case is resolved.

Keep reading to find out everything you need to know about refusing field sobriety tests in  Texas, or, if you’ve already failed, contact Turnbull Legal Group today at (832) 314-3232 to protect your future. 

What are the three field sobriety tests in Texas?

Before deciding whether to participate in anything an officer asks of you roadside, it helps to know exactly what's being requested. Every Texas officer trained in DWI enforcement uses three standardized field sobriety tests (SFSTs), developed and validated by the National Highway Traffic Safety Administration:

• Horizontal gaze nystagmus (HGN): The officer moves a pen or small flashlight side to side in front of your eyes and watches for involuntary jerking, which can become more pronounced when alcohol is present in the system.
• Walk-and-turn: You're instructed to take nine heel-to-toe steps along an imaginary or painted line, pivot on one foot, and walk back, while the officer scores your balance, timing, and ability to follow multi-step instructions.
• One-leg stand: You're asked to raise one foot roughly six inches off the ground and count aloud for 30 seconds while the officer watches for swaying, hopping, or setting your foot down early.

Officers sometimes tack on unofficial exercises, like reciting the alphabet or counting backward from a specific number, but only the three tests above are standardized. Everything else is a subjective add-on with no established scoring system and, frankly, very little evidentiary weight standing on its own.

The larger problem with standardized field sobriety testing in general is that these tests were not developed to detect impairment as much as they were to give an officer the ability to make arrests. Furthermore, these tests don’t account for medical conditions, road conditions, or fatigue, and they have incredibly complex administration instructions that officers often misinterpret. 

Can you refuse a field sobriety test in Texas?

Yes. A standard field sobriety test is a voluntary roadside exercise, not a chemical test, so it falls entirely outside the implied consent law that governs breath and blood testing. That means there is no automatic license suspension, fine, or standalone criminal penalty simply for declining to walk the line or follow the pen with your eyes. An officer cannot physically compel you to perform these exercises, and Texas law does not require you to attempt them.

That said, refusing doesn't end the stop, and it certainly doesn't guarantee you'll avoid arrest. 

Officers are trained to build a DWI case out of everything they observe well before a field sobriety test is ever requested, including your driving pattern, the odor of alcohol, slurred speech, bloodshot or watery eyes, and any statements you make during the stop. If that evidence already points toward intoxication in the officer's mind, an arrest can happen with or without your cooperation on the roadside exercises. 

In practice, declining usually just means the officer's report contains less structured, quantifiable evidence than it otherwise would have, which can be a real strategic advantage for your DWI attorneys in Houston challenging the arrest in court.

Does refusing a field sobriety test give a cop probable cause to arrest you?

No. Texas law doesn't allow an officer to treat a refusal, by itself, as automatic probable cause for arrest. Probable cause has to be built from independently observable facts: how you were driving before the stop, your appearance and behavior once you're face to face with the officer, and any admissions you make along the way. 

An officer can certainly note your refusal in the police report, and it may become one small piece of the totality of circumstances the officer relies on, but a refusal alone is not legally sufficient grounds for an arrest under Texas law. They might take your refusal personally and attempt to find other ways to arrest you, but it’s not a legal justification for arrest. 

The difference between a legally defensible arrest and an officer's after-the-fact justification for one is the sort of gap that a defense attorney can identify and challenge in a probable cause affidavit, but you’ll still need to hire the best DWI lawyers Houston has to offer if you want it to make a difference in court.

What happens if you reject a sobriety test?

Nothing happens to your license or your record automatically when you decline a field sobriety test; there's no suspension, no citation, and no separate charge tied to the refusal itself. What actually happens next depends almost entirely on what the officer already believed before asking:

• If the officer's other evidence is thin (no obvious signs of intoxication, no odor of alcohol, no erratic driving), a refusal can leave them without enough to justify an arrest, and the stop may end there.
• If the officer already believes they have enough evidence, a refusal doesn't prevent an arrest; you're simply arrested without a scored FST in the file.
• Your refusal gets documented in the police report and can be mentioned in court, though prosecutors generally can't treat it as an independent element of guilt the way they could a failed, scored test.
• An arrest for DWI moves you into a separate stage of the process, where the officer will ask for a breath or blood sample under Texas's implied consent law.

That last part carries its own, very different set of consequences, including an automatic license suspension and a fast-approaching deadline to file an ALR hearing request. Refusing a breathalyzer test in Texas DOES violate implied consent laws, and is usually followed by a warrant for a blood test that you cannot refuse. Field sobriety tests are one thing, but refusing blood alcohol tests can have real, immediate consequences for your DWI case.

Should you refuse a field sobriety test? An insider’s perspective.

Whether refusing is the right call depends entirely on your circumstances. Ned Turnbull spent 25+ years on both sides of the Texas courtroom, first as a Chief Prosecutor building DWI cases, then as a State District Court Judge evaluating the very evidence field sobriety tests produce. That dual perspective means our team knows exactly how prosecutors use, and often overuse, FST results, and exactly how judges across Harris, Brazos, and Montgomery Counties weigh that evidence once a case reaches trial.

Generally speaking, very little that happens roadside works in a driver's favor, and voluntarily performing unscored, subjective exercises on camera is no exception — even for sober drivers, since fatigue, nerves, old injuries, uneven pavement, and inappropriate footwear can all mimic the visible signs of intoxication that officers are trained to look for. 

Any attorney who knows how to beat a DWI will advise against volunteering additional, easily misinterpreted evidence at the roadside in the first place. It’s generally better to stay polite, compliant, and not perform any FSTs.

FAQ about refusing sobriety tests

A few more questions come up regularly from drivers facing this exact decision, either at the roadside or after an arrest.

Should I refuse a field sobriety test if I am sober?

Sobriety alone doesn't guarantee a good result. Field sobriety tests measure balance, coordination, and the ability to follow multi-step instructions — all of which can be thrown off by something as simple as heeled shoes, regardless of blood alcohol concentration. Many defense attorneys advise that even a sober driver has relatively little to gain, and a fair amount to lose, by performing exercises that produce subjective, easily misinterpreted results on an officer's dash or body camera.

Are field sobriety tests mandatory in any state?

No. No state can force a driver to perform roadside field sobriety tests — they're voluntary nationwide. Every state does, however, apply some version of implied consent to breath or blood testing following a lawful DWI arrest, so the specific consequences for refusing that second, separate type of test vary from state to state.

Can you refuse a field sobriety test and ask for a breathalyzer instead?

You can decline the field sobriety tests, but you don't get to choose which chemical test, if any, an officer requests afterward. If you're arrested, the officer decides whether to request a breath sample or a blood sample, and your implied consent obligations apply to whichever one they choose.

Can you refuse a breathalyzer in Texas?

Yes. Once you've been lawfully arrested on suspicion of DWI, Texas's implied consent law applies: by holding a Texas driver's license, you're considered to have already agreed to submit to a breath or blood test whenever an officer has probable cause to believe you're intoxicated. 

Refusing at this stage isn't itself a new criminal charge, but it does trigger additional Texas DWI penalties in the form of Administrative License Revocation, a process separate from your underlying DWI case. 

You have only 15 days from the date of your arrest to request an ALR hearing and formally fight the suspension. If you miss that window, the suspension takes effect automatically, no matter what ultimately happens with your criminal case. 

Filing an ALR hearing request quickly is one of the most time-sensitive steps in any Texas DWI case, and it's a deadline our team tracks closely for every client from day one.