Are Field Sobriety Tests Reliable in Alabama DUI Cases? What the Law Actually Says

February 24, 2026
John M. Totten

Executive Summary: Field sobriety tests in Alabama like the one-leg stand or walk-and-turn must follow strict guidelines to be valid in court. Factors like uneven roads, medical issues, poor instructions, or nervousness can affect results. These tests are not mandatory, and their accuracy is limited even when done correctly. If you’re facing a DUI based on one of these tests, it’s worth looking closely at how it was performed and whether it holds up under the law.

You get pulled over. The officer asks if you’ve been drinking. Then comes the flashlight in your eyes, a walk in a straight line, and the balance test. It feels like a pass/fail moment. But how reliable are these field sobriety tests? And can they actually hold up in an Alabama courtroom?

If you’re facing a DUI charge, it’s important to know that not all field sobriety tests are created equal, and not all of them follow the law. Here’s how Alabama handles these tests, and what can impact their validity in court.

What Is a Field Sobriety Test?

A field sobriety test is a set of physical and mental exercises officers use to decide if someone is impaired. These tests are typically done before a breath test and often form the basis for an arrest.

The three Standardized Field Sobriety Tests (SFSTs) recognized by the National Highway Traffic Safety Administration (NHTSA) are:

  1. Horizontal Gaze Nystagmus (HGN) – Following a pen or finger with your eyes
  2. Walk-and-Turn (WAT) – Walking heel-to-toe in a straight line and turning
  3. One-Leg Stand (OLS) – Standing on one foot and counting aloud

These tests are supposed to be given under strict procedures. If they aren’t, the results can be challenged in court.

Alabama DUI Law and Field Sobriety Tests

In Alabama, DUI arrests are governed by Code of Alabama § 32-5A-191, which covers driving under the influence of alcohol, drugs, or any impairing substance. Field sobriety tests are not required by law, and drivers can legally refuse to perform them. But officers rarely mention that during the stop.

Courts in Alabama allow field sobriety test results to be used as evidence, but only if the tests were administered properly. That means:

  • The officer was trained and followed the NHTSA guidelines
  • The conditions (lighting, road surface, weather) didn’t interfere
  • The person wasn’t physically or medically unable to perform the test
  • Instructions were clearly given and followed

If any of those things are off, the test results may not hold much weight in court.

Common Issues That Affect Validity

Field sobriety tests are not foolproof. In fact, these tests are not 100% reliable due to several factors, including:

  • Uneven pavement or poor lighting
  • Medical conditions like vertigo, balance issues, or past injuries
  • Age or weight—older or heavier individuals may struggle with balance-based tests
  • Fatigue, nerves, or language barriers
  • Improper instructions from the officer

If the test doesn’t follow the right procedure or the results are misinterpreted, they can be challenged in court.

Can Field Sobriety Tests Be Challenged?

Yes. A good defense may look at:

  • The officer’s body cam or dash cam footage
  • The officer’s training records
  • Environmental conditions at the scene
  • The driver’s medical history
  • Inconsistencies between the report and the video

Alabama courts have thrown out DUI charges where the only evidence was poorly administered or clearly flawed field sobriety tests.

You don’t need to prove the test was perfect, just that it’s not reliable enough to support a DUI conviction on its own.

What If You Refuse the Test?

You can legally refuse to take a field sobriety test in Alabama. However, that doesn’t mean the officer won’t arrest you. Refusal may raise suspicion and lead to further testing, like a breath or blood test. Still, refusing a field sobriety test does not carry the same penalties as refusing a chemical test under Alabama’s implied consent law. That’s an important distinction.

Field sobriety tests are one part of a DUI case, not the whole thing. If you’re facing charges and think the test was flawed, rushed, or unfair, don’t assume it’s over. These tests are only valid when done right, and many aren’t.

At John M. Totten, P.C., we take DUI defense seriously. If you were arrested based on a field sobriety test and have questions about whether it was valid, give us a call. We’ll go through every detail and fight to protect your rights.

John M. Totten
Latest posts by John M. Totten (see all)