Understanding Field Sobriety Tests in Texas: What You Need to Know

By Cheryl A. Wulf, Criminal Defense Lawyer in Tyler, TX

When you’re pulled over on suspicion of driving while intoxicated (DWI) in Texas, one of the first things a police officer may do is ask you to perform a field sobriety test in Texas. But how reliable are these tests—and do you have to take them?

In this article, we’ll break down the common types of field sobriety tests, how they work, and what you can do if you’ve been arrested based on these tests in or around Tyler, Texas.

What Are Field Sobriety Tests?

Field Sobriety Tests (FSTs) are a set of physical and cognitive tasks that law enforcement uses to assess a driver’s impairment. These tests were standardized by the National Highway Traffic Safety Administration (NHTSA) to help determine whether someone is under the influence of alcohol or drugs.

The 3 Standardized Field Sobriety Tests

1. Horizontal Gaze Nystagmus (HGN)
   The officer will ask you to follow a moving object (usually a pen or finger) with your eyes. They’re looking for involuntary jerking in the eyes, which may indicate intoxication.

2. Walk-and-Turn Test
   You’re asked to take nine heel-to-toe steps in a straight line, turn, and return the same way. Officers observe balance, coordination, and ability to follow instructions.

3. One-Leg Stand Test
   You must stand on one leg for 30 seconds while counting aloud. Swaying, hopping, or using arms for balance may be interpreted as signs of impairment.

❌ Are Field Sobriety Tests Mandatory in Texas?

No. You are not legally required to take a field sobriety test in Texas. Unlike a chemical breath test (which has legal penalties for refusal), declining a field test doesn’t result in automatic suspension of your license. However, officers may still arrest you based on other observations.

⚠️ Are Field Sobriety Tests Reliable?

Not always. Many factors can affect your performance:

• Medical conditions

• Nerve or joint problems

• Anxiety or fatigue

• Uneven or poorly lit surfaces

Even sober drivers can fail these tests.

️ How a Defense Attorney Challenges Field Sobriety Tests

At Cheryl A. Wulf, Attorney at Law, we examine every detail of your arrest:

• Did the officer properly administer the tests?

• Was body cam footage available?

• Did you have medical or physical issues that affected the results?

• Was there probable cause to initiate the stop?

A skilled DWI lawyer in Tyler can help fight back against weak or improperly conducted field tests.

What Should You Do If You’re Asked to Perform One?

• Be respectful and calm.

• Know your rights: You can refuse the test.

• Ask for an attorney immediately if you’re arrested.

️ Call Cheryl A. Wulf, Criminal Defense Lawyer in Tyler, TX

If you’ve been arrested based on field sobriety tests or a DWI charge, don’t face it alone. Call Cheryl A. Wulf at (903) 525-9869 or visit our Criminal Defense page to schedule a consultation.