Can Field Sobriety Test Results Be Wrong?

 Posted on November 06, 2025 in Criminal Defense

Field sobriety tests are often used during traffic stops when an officer believes a driver may be impaired. They are meant to measure things like your balance, coordination, and ability to follow instructions. However, these tests are known to be unreliable. They can produce results that suggest impairment even when you are sober. If you were arrested for DUI based on failed field sobriety tests, you need legal representation immediately. A Fairfax, VA DUI defense lawyer can help you build a strong defense based on the facts of your case.

How Do the Police Judge Field Sobriety Tests in Virginia?

Under Va. Code § 18.2-266, it is unlawful to operate a vehicle while you are impaired by alcohol or drugs. Before making an arrest, the officer must have probable cause. Field sobriety tests are often used to support that cause, even though they are not always reliable.

Police in Virginia rely on three standardized tests approved by the National Highway Traffic Safety Administration. These include the Horizontal Gaze Nystagmus test, the Walk-and-Turn test, and the One-Leg Stand test. During these tests, the officer watches how well you follow instructions and maintain balance.

The officer is looking for specific indicators, such as stepping off the line, swaying, or struggling to focus your eyes. However, the results are based on observation and interpretation. Two officers may interpret the same actions differently.

Common Reasons Why Field Sobriety Test Results Can Be Wrong

Alcohol and drugs are not the only reasons why people struggle with field sobriety tests. Conditions outside your control may affect how you perform. Some common factors that can lead to inaccurate results include:

• Medical conditions that affect balance, coordination, or muscle control

• Nervousness or stress during a police encounter

• Uneven pavement, gravel, or slippery surfaces

• Poor lighting, loud traffic, or flashing police lights

• Fatigue after a long day of work

• Foot pain, back pain, or recent injury

• Age-related balance challenges

• Confusing or rushed instructions from the officer

• Weather conditions such as rain, wind, or cold temperatures

• Improper footwear, such as sandals or heels

How Can an Attorney Challenge Field Sobriety Test Results?

Challenging the field sobriety tests may weaken the case against you and improve your ability to negotiate or defend yourself in court. A defense attorney might begin by examining how the tests were administered. They may request body camera footage, dash camera footage, and police records to look for errors. If the officer did not follow the required testing standards, your results may not be reliable or admissible in court.

An attorney may also look at your medical records. Conditions like vertigo, inner ear problems, or leg injuries may explain someone’s difficulties performing the test. Expert testimony can help show that the issue was physical rather than related to impairment.

Contact a Fairfax, VA DUI Defense Attorney Today

If you believe your field sobriety test results were inaccurate or unfair, you have options. Our attorneys can review the evidence, explain your rights, and help you make informed decisions about your case. We are available 24/7 to ensure you feel supported and understood throughout the legal process.

A DUI conviction can have a debilitating effect on your life. Let us help you fight it. Call Robinson Law, PLLC today at 703-844-3746 to schedule your free consultation with our team of Fairfax, VA DUI defense lawyers who have over 50 years of experience helping clients fight unfair allegations. Hablamos Español.