Field Sobriety Tests in Kentucky DUI Cases: What You...

Field Sobriety Tests in Kentucky DUI Investigations

Field sobriety tests (FSTs) are a standard tool used by Kentucky law enforcement to assess whether a driver is impaired. These tests are typically administered during a traffic stop before a formal arrest. Understanding how field sobriety tests work, their limitations, and your rights regarding these tests is critical for anyone who drives in Kentucky.

The Three Standardized Tests

The National Highway Traffic Safety Administration (NHTSA) has validated three standardized field sobriety tests that are used nationwide, including in Kentucky:

Horizontal Gaze Nystagmus (HGN): The officer observes the driver’s eyes as they follow a moving stimulus (usually a pen or finger). Involuntary jerking of the eye at certain angles can indicate intoxication. This test is considered the most reliable of the three standardized tests.
Walk-and-Turn (WAT): The driver is instructed to take nine heel-to-toe steps along a straight line, turn, and return nine steps. The officer looks for eight specific indicators of impairment, including inability to maintain balance, starting too soon, stepping off the line, and incorrect number of steps.
One-Leg Stand (OLS): The driver must stand on one foot while counting aloud for approximately 30 seconds. The officer watches for swaying, using arms for balance, hopping, or putting the foot down.

Non-Standardized Tests

Some officers may also administer non-standardized tests such as the finger-to-nose test, reciting the alphabet, counting backward, or the Romberg balance test. These tests have not been scientifically validated by NHTSA and may carry less weight in court.

Can You Refuse Field Sobriety Tests?

In Kentucky, you have the right to refuse field sobriety tests. Unlike chemical testing under the implied consent law, there is no statutory penalty specifically for refusing to perform FSTs. However, officers may still arrest you based on other observations of impairment, and prosecutors may argue that your refusal indicates consciousness of guilt. It is important to understand that field sobriety tests are voluntary — you cannot be forced to perform them.

Challenging FST Results

Officer Training: The administering officer must be properly trained and certified in NHTSA standardized field sobriety testing. If the officer lacks proper training, the test results may be challenged.
Administration Errors: Even minor deviations from NHTSA protocols can compromise the validity of FST results. Defense attorneys scrutinize the officer’s administration of each test.
Environmental Factors: Uneven terrain, poor lighting, adverse weather, heavy traffic, and footwear can all affect FST performance.
Medical Conditions: Inner ear problems, back and leg injuries, obesity, age over 65, and neurological conditions can all cause poor FST performance unrelated to alcohol impairment.
Reliability: Even when properly administered, NHTSA research shows the HGN test is only about 77% accurate, the WAT about 68%, and the OLS about 65% when used individually.

How Clark + Harris Can Help

Field sobriety test results are not infallible, and an experienced defense attorney can often effectively challenge them. Clark + Harris serves clients throughout Lexington and Louisville, bringing deep knowledge of FST science and NHTSA protocols to every DUI defense.

Call 859-474-0001 to have an attorney review the field sobriety evidence in your case.

Frequently Asked Questions

How soon should I contact Clark + Harris after being charged in Kentucky?

As soon as possible. Early representation protects your rights during questioning, preserves evidence, and often leads to better outcomes. Call 859-474-0001 — we respond promptly to new inquiries.

Does Clark + Harris represent clients throughout Kentucky?

Yes. We represent clients in all 120 Kentucky counties, both state District and Circuit courts, and federal courts in the Eastern and Western Districts of Kentucky.

What happens during a free consultation with Clark + Harris?

We review the specific charges and evidence, discuss available defenses, explain the likely process in the relevant court, and give you a clear roadmap of next steps — at no cost to you.

Related Resources

If this information applied to your situation, the following Clark + Harris guides may also be helpful:

Field Sobriety Tests in Kentucky DUI Cases: What You Should Know