Field Sobriety Exercises Are Not Mandatory and Carry No Pass/Fail Standard
Field sobriety tests are voluntary roadside exercises that officers use to build probable cause for a DUI arrest. Florida law does not require you to perform them, and no objective scoring system exists. Eagle Rock Defense Group represents drivers throughout Jacksonville and Northeast Florida who face DUI charges based on subjective field sobriety observations, challenging the reliability and administration of these exercises in Duval, St. Johns, Nassau, Clay, Flagler, Baker, and Bradford counties.
You are never required to perform field sobriety exercises during a traffic stop in Florida. Officers request these roadside tests to gather evidence of impairment, but you have the legal right to decline without automatic penalty. The results are subjective, reliant on officer interpretation, and frequently challenged in court.
Written by John Rockwell — Managing Partner, Eagle Rock Defense Group; former Duval County prosecutor with 21+ years of criminal defense experience. Eagle Rock Defense Group serves Jacksonville and surrounding Northeast Florida counties, focusing on DUI defense and the technical challenges to field sobriety evidence.
What Are Field Sobriety Exercises and Why Do Officers Use Them?
Field sobriety exercises are physical and cognitive tasks officers ask drivers to perform at the roadside to assess potential impairment. These tests include the horizontal gaze nystagmus (HGN), walk-and-turn, and one-leg stand. Law enforcement uses them to establish probable cause for arrest under Florida Statutes, which define DUI as driving or being in actual physical control of a vehicle while impaired by alcohol or controlled substances to the extent that normal faculties are impaired.1
Officers observe divided-attention tasks — activities requiring simultaneous physical coordination and mental focus — to document behaviors they interpret as signs of impairment. The results feed into the arrest report and become evidence at trial. However, these exercises are not scientific instruments with binary outcomes; they are observational tools subject to human error, environmental conditions, and individual physical differences.
Florida law does not mandate participation in field sobriety exercises. You may politely decline without triggering an automatic license suspension or separate criminal charge. Refusal to perform roadside exercises is distinct from refusal to submit to a breath, blood, or urine test after arrest, which carries administrative penalties under Florida’s implied consent statute.2
Are Field Sobriety Tests Pass/Fail?
No standardized scoring system exists that conclusively determines pass or fail on field sobriety exercises. The National Highway Traffic Safety Administration (NHTSA) publishes guidelines for administering three standardized tests, but officers apply subjective judgment when interpreting clues of impairment. A driver may exhibit one or two clues on a walk-and-turn test due to age, footwear, uneven pavement, or medical conditions, yet the officer marks the performance as failed.
Defense attorneys challenge field sobriety evidence by demonstrating that the exercises were improperly administered, that environmental factors compromised performance, or that the officer’s training and experience did not equip them to accurately assess the clues. Video evidence often reveals discrepancies between the officer’s written report and the driver’s actual performance, undermining the reliability of the arrest decision.
| Exercise | What It Tests | Common Clues | Defense Challenges |
|---|---|---|---|
| Horizontal Gaze Nystagmus | Involuntary eye movement | Lack of smooth pursuit, nystagmus at maximum deviation | Medical conditions, improper stimulus speed, officer training gaps |
| Walk-and-Turn | Divided attention, balance | Stepping off line, improper turns, raising arms | Surface conditions, footwear, age, injury, instructions unclear |
| One-Leg Stand | Balance, divided attention | Swaying, hopping, putting foot down | Weight, age, footwear, lighting, officer demonstration errors |
| Non-Standardized Tests | Varies | Finger-to-nose, alphabet recitation | Not validated by NHTSA, highly subjective, inadmissible in some courts |
How Does Eagle Rock Defense Group Challenge Field Sobriety Evidence?
We attack the administration, documentation, and interpretation of field sobriety exercises through cross-examination and expert testimony. John Rockwell’s background as a former Duval County prosecutor provides insight into how the State builds DUI cases and where weaknesses appear in field sobriety evidence. We obtain dashcam and body-worn camera footage, review officer training records, and consult with experts who testify about NHTSA protocols and the margin of error in roadside testing.
Common defense strategies include demonstrating that the officer failed to provide clear instructions, conducted tests on sloped or uneven ground, or misinterpreted clues that have innocent explanations. Medical records, witness testimony, and video analysis often reveal that a driver’s performance was consistent with sobriety or that the officer lacked sufficient training to administer the HGN test properly. In cases where non-standardized tests were used, we argue that the exercises have no scientific validation and should carry little to no weight.
Florida’s DUI statute establishes a presumption of impairment at a blood alcohol concentration of 0.08 or higher, but field sobriety exercises do not measure BAC.1 They provide only circumstantial evidence of impairment, and circumstantial evidence can be rebutted. When prosecutors rely heavily on field sobriety observations because breath test results are unavailable or marginally above the legal limit, a strong defense can result in reduced charges or dismissal.
If you face DUI charges in Jacksonville or Northeast Florida and field sobriety exercises form a key part of the State’s case, call Eagle Rock Defense Group at 904-310-7501“>904-310-7501 for a confidential consultation. We review the evidence, identify procedural errors, and build a defense tailored to the facts of your stop.
What Happens If You Refuse Field Sobriety Exercises?
Refusing field sobriety exercises does not result in automatic administrative penalties, but the officer may still arrest you based on other observations. Odor of alcohol, slurred speech, bloodshot eyes, and driving patterns provide independent grounds for probable cause. The refusal itself cannot be introduced as consciousness of guilt in Florida courts, though prosecutors may attempt to use it to suggest you knew you were impaired.
Officers often imply that refusing field sobriety tests will lead to arrest regardless, and in many cases that is true — the stop has already progressed to the point where the officer intends to make an arrest. Performing the exercises may simply provide additional evidence the State will use against you. Your right to decline is protected, and whether you participate or refuse, you should contact a DUI defense attorney immediately after release.
Frequently Asked Questions
Can I be arrested for DUI if I refuse field sobriety exercises?
Yes. Officers may arrest you based on other observations such as odor of alcohol, erratic driving, bloodshot and/or watery eyes, slurred speech, unstable gait or swaying, or statements you made during the stop. Refusal eliminates one source of evidence but does not prevent arrest in some circumstances.
Are field sobriety exercises required by Florida law?
No. Florida law does not require you to perform roadside field sobriety exercises. You may politely decline, and the refusal carries no automatic administrative penalty like breath test refusal does.
Can medical conditions affect field sobriety test performance?
Yes. Injuries, vertigo, neurological conditions, joint problems, and age-related balance issues can all impair performance. Defense attorneys use medical records and expert testimony to explain poor performance unrelated to alcohol or drug use.
What is the difference between field sobriety exercises and a breath test?
Field sobriety exercises are voluntary roadside tasks that produce subjective observations. Breath tests measure blood alcohol concentration and are conducted after arrest. Refusal to submit to a lawfully requested breath test after arrest triggers administrative license suspension under Florida’s implied consent law and is a criminal offense in and of itself separate from the DUI.
How do I know if the officer administered the tests correctly?
Video evidence and officer training records reveal whether NHTSA protocols were followed. An experienced DUI attorney reviews these materials and identifies procedural errors that undermine the reliability of the test results. Related Resources:
- DUI Defense – Jacksonville DUI Attorney
- Criminal Defense Practice Areas
- Criminal Refusal Attorney Jacksonville
- CDL DUI Attorney Jacksonville
- Underage DUI Lawyer Jacksonville
Field sobriety exercises are subjective, voluntary, and frequently challenged. If you were arrested for DUI in Jacksonville or surrounding counties after performing roadside tests, contact Eagle Rock Defense Group at 904-310-7501“>904-310-7501. We examine every detail of your stop and build a defense that protects your rights and your future.
Written by John Rockwell — Managing Partner, Eagle Rock Defense Group; former Duval County prosecutor; 21+ years of criminal defense experience. Updated July 2026.