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How Allergies Mimic Impairment 
Seasonal allergies in South Carolina often peak in early spring and late summer, particularly in areas like Greenville County, where pollen counts rise sharply during these months. Allergy sufferers may experience watery, bloodshot eyes, frequent sneezing, nasal congestion, and even fatigue. Each of these symptoms can be misinterpreted during a roadside evaluation. For example, red, bloodshot eyes are a commonly cited indicator of marijuana use during field sobriety tests. A driver sneezing repeatedly while performing a walk-and-turn or one-leg-stand test may appear uncoordinated. Fatigue caused by allergies may slow reaction times, causing officers to conclude that a driver’s ability to operate a vehicle safely is compromised. These visual cues, while innocent in isolation, can influence an officer’s judgment, sometimes leading to wrongful DUI arrests if proper medical context is not considered.
Allergy Medications and Their Effects on Driving
Many South Carolina residents rely on antihistamines, decongestants, or combination cold and allergy medications to manage symptoms. While effective in reducing allergic reactions, some of these medications can cause side effects that mimic signs of intoxication. Common effects include drowsiness, delayed reaction times, reduced coordination, and temporary cognitive impairment. During standard field sobriety tests, such as the walk-and-turn or one-leg stand, even minor coordination issues may be flagged as impairment. A driver who has taken an over-the-counter antihistamine may perform poorly on these tests despite having a zero blood alcohol concentration. In some instances, officers may also misinterpret fatigue or slowed responses as drug impairment. The Bateman Law Firm emphasizes documenting medication usage, medical conditions, and timing to provide context for these evaluations.
Red Eyes and Field Sobriety Tests
The Horizontal Gaze Nystagmus (HGN) test is one of the most common field sobriety tests in South Carolina. This test measures involuntary eye movements that can indicate intoxication. However, red or irritated eyes caused by allergies can affect how eyes track during this test. Dust, pollen, and seasonal irritants can cause nystagmus-like responses unrelated to alcohol or drug use. Officers may not always distinguish between medically induced eye movements and true alcohol-related nystagmus. Combining HGN observations with other FST results and driver demeanor can sometimes create a misleading impression of impairment, particularly when the driver’s condition is influenced by allergies or prescribed medications.Chemical Testing Considerations
Breathalyzers, blood tests, and urine tests remain the gold standard for determining alcohol or drug impairment. In most cases, allergies and medications do not affect blood alcohol content or chemical test results directly. However, certain cough syrups, nasal sprays, or liquid medications containing trace amounts of alcohol may cause minor, temporary elevations in preliminary breath test readings. While confirmatory blood tests typically reveal no impairment, initial roadside tests could influence an officer’s decision to arrest. Having independent chemical testing can help establish objective evidence that a driver was not impaired, which is a strategy frequently recommended by The Bateman Law Firm."He has an innate ability to convey to clients what really matters in their cases."
"John Bateman is my absolute go to peer in the legal field when it comes to questions about DUI. . . . He has an innate ability to convey to clients what really matters in their cases. As a fellow attorney, I highly recommend John to anyone in the SC or NC areas who are looking for... legal representation when facing a DUI charge."
M. Brock
"An excellent DUI attorney. He has received the same field sobriety test training as all police officers in the State"
"John is an excellent DUI attorney. He has received the same field sobriety test training as all police officers in the State, and also the same training as the people who are the instructors of the police officer training courses on field sobriety tests. He is very passionate about DUI's and I recommend him often to people who are facing serious charges in the upstate area."
P. Hammond
"He cares for each of his clients and works extremely hard to achieve results."
"Very knowledgeable and thorough in his preparation and representation of his clients. He cares for each of his clients and works extremely hard to achieve results. I highly recommend this lawyer."
C. Grubbs
Medical Documentation and Expert Testimony
For drivers facing a DUI in Greenville or other Upstate South Carolina locations, medical documentation can be a critical component of defense. Allergy diagnoses, prescription records, and physician notes provide objective evidence that observed impairment was unrelated to alcohol or drugs. In complex cases, expert testimony from medical professionals may clarify the effects of medication or medical conditions on coordination and cognitive function. The Bateman Law Firm routinely consults with experts to strengthen defenses, ensuring that factors such as pollen exposure, antihistamine use, or other medical conditions are accurately represented in court.Practical Steps During a Traffic Stop
Drivers experiencing allergy symptoms or taking medication should consider a cautious approach during traffic stops:- Calmly inform the officer of any relevant medical conditions or medications.
- Avoid making spontaneous admissions unrelated to the officer’s questions.
- Document medication usage and timing relative to the stop.
- Request legal representation immediately to safeguard rights and ensure accurate testing.
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