If you’ve been stopped by police and asked to perform a field sobriety test in Kentucky, the outcome of that test can play a significant role in your DUI case. However, many defendants don’t realize that these tests are far from perfect, considering the subjectivity that is involved and how often they are administered incorrectly.
A failed field sobriety test does not automatically mean you’ll be convicted of drunk driving. With the help of a respected criminal defense lawyer, you can challenge the results and fight to keep them out of court. If you have been charged with a DUI in Kentucky, understanding the inherent flaws in field sobriety testing is the first step toward building a strong defense and protecting your rights.
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How Field Sobriety Tests Work in Kentucky
Field sobriety tests (FSTs) are a set of physical and cognitive exercises designed to help police officers determine whether a driver is impaired. These tests are standardized by the National Highway Traffic Safety Administration (NHTSA) and are intended to be conducted uniformly across the country.
The three standardized tests are:
- Horizontal Gaze Nystagmus (HGN): The officer asks you to follow a pen or flashlight with your eyes. They look for involuntary jerking movements, which can be a sign of intoxication.
- Walk-and-Turn Test: You must take nine heel-to-toe steps in a straight line, turn on one foot, and walk back the same way.
- One-Leg Stand Test: You are asked to stand on one leg for about 30 seconds while counting aloud.
Police officers sometimes add non-standardized tests, such as reciting the alphabet backward. However, these are not recognized by NHTSA and carry even less scientific validity.
Why Field Sobriety Tests Are Often Unreliable
Although field sobriety tests are widely used, their accuracy has been questioned by scientists, courts, and defense attorneys for decades. According to NHTSA’s own studies, even when conducted correctly, FSTs are only 65–77% accurate in identifying impairment.
Several factors can cause sober individuals to “fail” these tests, such as:
- Uneven road surfaces
- Poor lighting
- Distracting traffic conditions
- Anxiety during the stop
- Physical disabilities
- Improper footwear
- Weather conditions
- Officer bias
- Failure to follow NHTSA guidelines
In Kentucky, prosecutors frequently use FST results as evidence of impairment, but they are not foolproof. A Louisville criminal defense lawyer can cross-examine the arresting officer to highlight every possible source of error.
Legal Grounds for Challenging a Field Sobriety Test
Your defense lawyer can challenge field sobriety tests in several ways, depending on the facts of your case.
Improper Administration
Officers must follow strict NHTSA protocols when giving field sobriety tests. If they deviate from those procedures, the results may be deemed unreliable. For instance, if an officer conducts the test on a slope, it can render the test invalid.
Lack of Probable Cause
Police must have reasonable suspicion to stop your vehicle and probable cause to arrest you for DUI. If your attorney can show that the officer lacked a valid reason for the traffic stop or arrest, any evidence obtained (including the field sobriety test) can be suppressed.
Medical and Physical Conditions
Many health conditions can affect your balance and coordination. Issues such as vertigo and leg injuries can make it nearly impossible to perform these tasks correctly. A medical expert can testify to these effects in your defense.
Environmental and External Factors
Conditions like poor lighting and strong winds can interfere with your ability to perform the tests accurately. Body camera footage could help show that the testing environment was unsuitable.
Officer Subjectivity
Field sobriety tests rely on the officer’s personal observations rather than objective data. Your lawyer can argue that the results are unreliable because they depend entirely on the officer’s interpretation.
The Role of a Kentucky DUI Defense Lawyer
A Louisville criminal defense attorney can work to identify weaknesses in how your field sobriety test was handled.
A few of the steps they can take include:
- Reviewing police reports, dashcam, and body cam footage for inconsistencies
- Cross-examining the officer about their training and adherence to testing procedures
- Presenting expert witnesses to explain other factors that may have been at play
- Investigate the use (or lack) of other sobriety tests, such as a breath test
- File motions to suppress the test results if your rights were violated
- Negotiate with prosecutors to dismiss your DUI charges if possible
The ultimate goal here is to prevent unreliable field sobriety test results from influencing the outcome of your case.
Schedule a Free Consultation With an Experienced Louisville DUI Attorney Today
If you were arrested for DUI in Kentucky after failing a field sobriety test, you may still have an effective defense to raise. These tests are not as reliable as law enforcement claims, and their results can often be excluded from the case against you.
For more information, contact the criminal defense attorneys at Suhre & Associates DUI and Criminal Defense Lawyers give us a call today at (502) 371-7000 or visit us at our Louisville Law Office.
Suhre & Associates DUI and Criminal Defense Lawyers – Louisville
214 Clay Street, Suite A,
Louisville, KY 40202
(502) 371-7000
