The Role of Field Sobriety Tests in DUI Cases

The Role of Field Sobriety Tests in DUI Cases

Field Sobriety Tests are commonly used by law enforcement officers to assess a driver’s level of impairment during a DUI stop. These tests are designed to evaluate balance, coordination, and cognitive ability, helping officers determine whether a driver is under the influence. However, many factors can influence test results, leading to wrongful arrests. If you have been charged with DUI, it is crucial to understand how these tests work and whether they can be challenged in court. Seeking representation from an experienced DUI attorney can help you fight unfair charges and protect your rights.

How Law Enforcement Uses Field Sobriety Tests in DUI Cases

Field Sobriety Tests (FSTs) are standardized physical and cognitive assessments conducted during DUI stops. Officers administer these tests to gather probable cause for an arrest and to determine whether further chemical testing is necessary. The three standardized Field Sobriety Tests recognized by the National Highway Traffic Safety Administration (NHTSA) include:

  • Horizontal Gaze Nystagmus (HGN) Test – Measures involuntary eye movements when following an object, such as a pen or flashlight.
  • Walk-and-Turn Test – Evaluates a driver’s ability to follow directions and maintain balance while walking in a straight line.
  • One-Leg Stand Test – Assesses a driver’s balance and coordination by having them stand on one leg for a designated time.

While these tests are widely used, their accuracy is often questioned. If you have been charged with DUI based on Field Sobriety Tests, a skilled DUI attorney can help determine whether the results were unfairly used against you.

The Accuracy and Limitations of Field Sobriety Tests

Despite their widespread use, Field Sobriety Tests are not always reliable indicators of impairment. Several factors can impact test results, including:

  • Medical Conditions – Neurological disorders, vertigo, and past injuries can cause balance issues unrelated to alcohol or drug impairment.
  • Nervousness or Anxiety – Being pulled over by the police can be stressful, leading to shaky movements or mistakes unrelated to intoxication.
  • Poor Road or Weather Conditions – Uneven pavement, wet roads, or poor lighting can affect a driver’s ability to perform tests accurately.
  • Improper Officer Instructions – If the officer does not administer the tests correctly, the results may be invalid.

Given these limitations, it is essential to challenge Field Sobriety Tests in court when they serve as the primary basis for a DUI arrest. An experienced DUI attorney can argue against the validity of the test results and seek to have the charges reduced or dismissed.

Your Legal Rights When Asked to Perform Field Sobriety Tests

In California, drivers are not legally required to participate in Field Sobriety Tests during a DUI stop. Unlike chemical tests (such as breath or blood tests) that are mandatory after an arrest under the state’s implied consent laws, FSTs are voluntary. If an officer asks you to perform these tests, you have the right to decline without legal penalties. However, refusing may still lead to an arrest if the officer believes there is enough evidence of impairment.

If you are unsure about your rights during a DUI stop, it is best to remain calm, be respectful, and contact a DUI attorney as soon as possible.

The Role of Field Sobriety Tests in DUI Convictions

While Field Sobriety Tests can be used as evidence in DUI cases, they are not always conclusive. Many courts recognize their limitations and allow defense attorneys to challenge their accuracy. Here’s how they can impact your case:

  • Probable Cause for Arrest – If you fail FSTs, officers may use the results as justification for an arrest and subsequent chemical testing.
  • Evidence in Court – Prosecutors may present test performance as evidence of impairment, even if chemical test results are inconclusive.
  • Defense Strategies – A DUI attorney can challenge the test’s reliability and argue that external factors contributed to poor performance.

Since Field Sobriety Tests are subjective, a strong legal defense can highlight flaws in the officer’s assessment and weaken the prosecution’s case.

Challenging the Validity of Field Sobriety Tests in Court

If you were charged with DUI based on Field Sobriety Tests, there are several defense strategies that a DUI attorney can use to fight the charges:

  1. Medical Conditions or Disabilities
  • Your attorney can present medical records proving that physical impairments affected your ability to perform the tests.
  1. Officer Misconduct or Improper Administration
  • If the officer failed to follow standardized procedures, your attorney could argue that the results are invalid.
  1. External Environmental Factors
  • Poor road conditions, bad weather, or inappropriate footwear can affect test performance.
  1. Lack of Probable Cause
  • If the arrest was based solely on Field Sobriety Tests without strong evidence of impairment, the case may be dismissed.

By identifying weaknesses in the prosecution’s case, a skilled DUI attorney can work toward reducing or dismissing the charges.

What to Do If You Are Charged with DUI Based on Field Sobriety Tests

If you have been arrested for DUI based on Field Sobriety Tests, follow these steps to protect your rights:

  1. Remain Calm and Cooperate Politely
  • Avoid arguing with the officer and comply with lawful requests, but remember that FSTs are voluntary.
  1. Do Not Admit Guilt
  • Anything you say can be used against you, so limit your statements and avoid discussing test performance.
  1. Request Legal Representation Immediately
  • Contact a DUI attorney as soon as possible to discuss your case.
  1. Document the Details of the Stop
  • Write down everything you remember, including the officer’s instructions, road conditions, and your medical history.
  1. Prepare for Your Court Date
  • Work with your attorney to gather evidence and build a strong defense strategy.

Field Sobriety Tests play a significant role in DUI cases, but they are not always reliable indicators of impairment. If you have been charged with DUI, challenging the accuracy of these tests can be a crucial part of your defense. An experienced DUI attorney can examine the details of your case, dispute the validity of the tests, and work to minimize or dismiss the charges against you. Don’t face DUI charges alone—seek legal representation today to protect your rights and your future.

Schedule an Appointment for a Free Consultation

If you’re facing a DUI charge in Pomona or surrounding area, don’t wait to seek legal representation. With offices in Pomona, Rancho Cucamonga, West Covina, and Riverside, David Canty is ready to fight for you. Contact us today to schedule a free consultation and let us help you navigate the complex legal process, protect your rights, and fight for the best possible outcome in your DUI case.

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If you or a loved one needs help in one of the following areas, please fill out the form and someone from our office will respond as quickly as possible.