Medical Conditions Can Affect Field Sobriety Test Performance in Georgia DUI Cases
A roadside DUI investigation can move quickly. An officer asks a driver to step out of the vehicle, gives a series of instructions, and watches closely for a missed step, raised arm, loss of balance, or unusual eye movement. Those observations may later appear in the arrest report as signs of impairment.
For a driver with an existing physical limitation, the same movements may have a very different explanation. A prior knee injury, balance disorder, neurological condition, vision problem, or limited mobility can affect how someone performs before alcohol or drugs enter the picture. Early guidance from an experienced Atlanta DUI arrest lawyer can help place the officer’s roadside observations alongside the driver’s physical condition and the recorded circumstances of the stop.
Field Sobriety Tests Rely Heavily on Physical Performance
The National Highway Traffic Safety Administration’s standardized field sobriety testing program centers on three tests: the horizontal gaze nystagmus test, the walk-and-turn, and the one-leg stand. Each asks an officer to watch for specific clues while following a standardized procedure. NHTSA’s field sobriety testing training materials also recognize that officers need to consider physical problems that could interfere with performance.
The walk-and-turn and one-leg stand require coordination, balance, and controlled movement. HGN requires the officer to observe the eyes as they follow a moving stimulus. Poor performance may support an officer’s suspicion of impairment, but the physical reason for a particular clue still deserves attention when a known limitation could produce the same observation.
Roadside testing also happens under conditions far removed from a controlled examination room. A driver may be standing beside traffic at night, listening to unfamiliar instructions while being recorded and watched by an officer. A physical limitation that is manageable during an ordinary day can become much more noticeable during a test that deliberately demands balance or precise movement.
Orthopedic Problems Can Affect Walking and Standing Tests
A person with an old ankle injury may have trouble pivoting during the walk-and-turn. Someone with knee or hip problems may place a foot down early during the one-leg stand. Back pain or restricted range of motion may also affect stance, balance, or the ability to maintain the position the officer demonstrated.
These details have a direct connection to the clues officers record. Stepping off the line, using the arms for balance, taking an incorrect turn, or putting a raised foot down may appear consistent with impairment on an arrest report. Body-camera footage may show stiffness, an uneven gait, or difficulty moving even before the field tests begin.
Previous surgery or a longstanding orthopedic problem can add useful context when it matches what appears on the video. A driver who limps while walking from the vehicle and later struggles with the one-leg stand presents a different factual picture from someone whose balance difficulty first appears during formal testing.
Neurological and Balance Limitations May Resemble DUI Clues
Some physical conditions affect coordination without producing an obvious limp or visible injury. Neurological problems, peripheral nerve issues, tremors, or disorders involving balance can influence posture and movement in ways an officer may interpret as intoxication.
A balance limitation may show up as swaying during instructions, raising the arms while walking, moving a foot to remain upright, or struggling to hold one leg off the ground. Neurological conditions can also affect fine motor control and the speed with which a person responds to physical instructions. The roadside report may record the movement accurately while leaving its cause unresolved.
That distinction becomes particularly relevant when the officer learned about a condition before administering the tests. Body-camera audio may capture the driver describing a balance problem, prior injury, or mobility restriction. The officer’s response and the testing that followed become part of the same evidentiary record.
Vision and Eye Conditions Can Complicate HGN Observations
The horizontal gaze nystagmus test is different from the two balance tests because the driver is generally asked to remain still and follow a stimulus with the eyes. The officer watches eye movement at specific positions during the test.
NHTSA training calls for preliminary observations of the eyes as part of the standardized procedure, including checks related to tracking and pupil size. Existing vision or eye conditions can provide important context when something unusual appears before the officer begins looking for HGN clues.
Prior eye injuries, certain visual limitations, or a documented history of abnormal eye movement may deserve closer attention when HGN plays a substantial role in the arrest decision. The relevance lies in connecting a known condition to what the officer actually observed rather than treating the HGN result as an isolated entry in a police report.
Video can also reveal how the test was conducted. The positioning of the stimulus, the officer’s instructions, interruptions, lighting, and the driver’s ability to see and follow the object all form part of the roadside encounter.
Body-Camera Footage Can Preserve Details the Report Leaves Out
A written DUI report usually condenses several minutes of interaction into a short description. Phrases such as “swayed,” “lost balance,” or “stepped off line” do not necessarily show what happened immediately before or after the movement.
Body-camera and patrol-car footage may provide considerably more detail. A driver might walk normally in one respect while consistently favoring an injured leg. The officer may ask about physical problems before testing, or the driver may volunteer one without being prompted. The footage can show the surface where the test occurred, how the instructions were demonstrated, and whether a mobility problem was visible throughout the encounter.
Movement outside the formal tests can also provide context. How the driver exited the vehicle, stood during conversation, retrieved a license, or walked after the tests may help show whether a particular physical characteristic was present throughout the stop.
Existing Medical History Can Give Roadside Performance Context
Documentation created before a DUI arrest can be particularly useful because it establishes that a physical limitation already existed. Records of orthopedic treatment, surgery, physical therapy, neurological care, vision treatment, or mobility restrictions may correspond with specific difficulties visible during the roadside testing.
Timing and consistency matter. A longstanding knee problem documented well before the traffic stop may help explain why a driver could not keep one leg raised. A previous balance diagnosis may correspond with repeated swaying that appears on body-camera footage. The medical information has a focused role: connecting an established limitation to a particular roadside observation.
A careful review with an experienced Atlanta DUI arrest lawyer can place that history alongside the video, police report, and manner in which the tests were administered. Keeping those pieces together helps prevent a physical limitation from being evaluated solely through the language used in the arrest report.
Georgia DUI Law Focuses on Whether the Driver Was Less Safe
Georgia’s DUI statute reaches driving while under the influence of alcohol, drugs, or certain other substances to the extent that the person is less safe to drive. O.C.G.A. § 40-6-391 provides the statutory framework for those charges.
Field sobriety performance may contribute to an officer’s decision to make an arrest, but the roadside tests exist within a larger sequence of events. Driving behavior, the conversation with the officer, physical observations, video evidence, chemical testing, and other circumstances may also become part of the DUI case.
When a medical or physical limitation affects one of the observations attributed to intoxication, separating that limitation from genuine evidence of impairment can change how the roadside encounter is understood. A missed step carries less explanatory value when the video and existing history show that the driver regularly struggles with the same movement.
Contact The Spizman Firm Today
A DUI arrest can be frustrating when physical difficulties that existed long before the traffic stop are recorded as evidence of intoxication. Roadside testing captures only a short period of time, and the circumstances surrounding each observed clue deserve careful attention.
If a medical condition, prior injury, balance problem, vision limitation, or mobility issue may have affected your field sobriety testing, contact The Spizman Firm to speak with an experienced Atlanta DUI field sobriety tests lawyer about the circumstances surrounding your arrest and the evidence recorded during the roadside investigation.
Sources:
Georgia Code, O.C.G.A. § 40-6-391, Driving Under the Influence of Alcohol, Drugs, or Other Intoxicating Substances
law.justia.com/codes/georgia/title-40/chapter-6/article-15/section-40-6-391/
National Highway Traffic Safety Administration, DWI Detection and Standardized Field Sobriety Testing Training Materials
nhtsa.gov/search?keywords=standardized%20field%20sobriety%20testing