Field Sobriety Tests (FSTs) play a critical role in Driving While Intoxicated (DWI) arrests. Law enforcement officers use these tests to determine whether a driver is impaired and to establish probable cause for an arrest. Understanding how these tests work, their limitations, and the potential defenses against their results is crucial for anyone facing a DWI charge. 

What are Field Sobriety Tests?

Field Sobriety Tests are a series of physical and cognitive exercises administered by police officers during traffic stops to assess a driver’s level of impairment. The National Highway Traffic Safety Administration (NHTSA) has standardized three main tests:

Horizontal Gaze Nystagmus (HGN) Test

1. How it works: The officer asks the driver to follow a moving object, such as a pen or flashlight, with their eyes. The officer observes the driver’s eye movements for signs of nystagmus, an involuntary jerking of the eyes, which can indicate intoxication.
2. What the officer looks for: Lack of smooth pursuit, distinct nystagmus at maximum deviation, and onset of nystagmus before 45 degrees.

Walk-and-Turn (WAT) Test

1. How it works: The driver is instructed to take nine steps, heel-to-toe, along a straight line, turn on one foot, and return in the same manner.
2. What the officer looks for: Balance, ability to follow instructions, and coordination. Indicators of impairment include starting before instructions are finished, losing balance, stopping while walking, failing to touch heel-to-toe, using arms for balance, turning improperly, and taking an incorrect number of steps.

One-Leg Stand (OLS) Test

1. How it works: The driver must stand on one leg while counting aloud until told to stop (usually for 30 seconds).
2. What the officer looks for: Swaying, using arms for balance, hopping, or putting the foot down, which can indicate impairment.

Limitations and Challenges of Field Sobriety Tests

While Field Sobriety Tests are widely used, they are not infallible and have several limitations:

1. Subjectivity: The interpretation of FST results relies heavily on the officer’s judgment, which can be influenced by biases or lack of proper training.
2. Physical Conditions: Medical conditions, injuries, and physical disabilities can affect a person’s performance on these tests, leading to false positives.
3. Environmental Factors: Poor lighting, uneven surfaces, inclement weather, and distractions can negatively impact test results.
4. Nervousness and Stress: Being stopped by the police can cause anxiety and nervousness, which can impair a driver’s performance on FSTs even if they are not intoxicated.

Legal Defenses Against Field Sobriety Test Results

Challenging the results of Field Sobriety Tests is a common defense strategy in DWI cases. Here are some potential defenses:

1. Improper Administration: Officers must adhere to strict protocols when administering FSTs. Any deviation from these protocols can be grounds for challenging the test results.
2. Lack of Probable Cause: If the officer did not have sufficient reason to initiate the traffic stop or administer the FSTs, the evidence obtained may be inadmissible in court.
3. Medical and Physical Conditions: Demonstrating that medical conditions or physical impairments affected the test results can help undermine the prosecution’s case.
4. Environmental and External Factors: Highlighting adverse environmental conditions or external factors that could have influenced the test performance can cast doubt on the reliability of the results.
5. Officer’s Training and Experience: Questioning the officer’s training, experience, and ability to properly administer and interpret the FSTs can be an effective defense strategy.

The Importance of Legal Representation

Given the complexities and potential pitfalls of Field Sobriety Tests, having an experienced DWI attorney is crucial. David Breston, a seasoned DWI attorney, can provide invaluable assistance in navigating the legal system, challenging FST results, and building a robust defense. Here’s how an attorney can help:

1. Case Evaluation: A thorough evaluation of the case to identify weaknesses in the prosecution’s evidence and the circumstances surrounding the traffic stop and FST administration.
2. Evidence Gathering: Collecting and analyzing evidence, such as dashcam footage, police reports, and witness statements, to challenge the validity of the FST results.
3. Expert Testimony: Utilizing expert witnesses to testify about the unreliability of FSTs, the effects of medical conditions, and other factors that could have impacted the test performance.
4. Negotiation and Plea Bargaining: Negotiating with the prosecution to seek reduced charges or alternative sentencing options, such as diversion programs or probation.
5. Court Representation: Providing strong representation in court, presenting a compelling defense, and advocating for the defendant’s rights throughout the legal process.

Conclusion

Field Sobriety Tests are a critical component of DWI arrests, but they are not without their flaws. Understanding the limitations and potential defenses against these tests is essential for anyone facing a DWI charge. If you find yourself facing a DWI charge, seeking professional legal assistance is crucial to protect your rights and ensure a fair legal process.