Many people assume that if police believe a driver is impaired, the driver must have been drinking or using drugs. But that assumption is not always correct.
Alcohol is often easier for police officers to detect because of its smell and physical indicators. Drugs, however, may not have obvious signs, which can make impairment more difficult for law enforcement to identify.
Even more importantly, several medical conditions mistaken for DUI impairment can produce symptoms that closely resemble alcohol or drug intoxication.
Law enforcement officers receive specialized training through programs like Advanced Roadside Impaired Driving Enforcement (ARIDE) to detect alcohol and drug impairment during traffic stops. Interestingly, the same training also teaches officers that many medical conditions can mimic the signs of intoxication.
Understanding these conditions is important because innocent drivers can sometimes appear impaired when they are actually experiencing a medical issue.
A skilled Utah DUI criminal defense attorney can challenge the accuracy of field sobriety testing, non-standard field sobriety testing, and the officer’s investigation for lack of probable cause to arrest for a DUI.
Below are several examples discussed in impaired-driving training.
1. Head Injuries and Brain Trauma Mimic DUI Impairment
A recent head injury or concussion can cause symptoms that look very similar to intoxication.
These symptoms may include:
• Confusion • Poor balance • Slurred speech • Slow responses • Difficulty concentrating
From an officer’s perspective during a roadside investigation, these symptoms may resemble alcohol or drug impairment. However, they may actually be the result of a serious medical emergency involving head trauma or a concussion.
Drivers suffering from a head injury may not even realize they are injured, which can further complicate the situation during a traffic stop.
2. Stroke
A stroke can produce symptoms that closely resemble DUI impairment. In some cases, the remnants of a prior stroke may also mimic DUI indicators to police officers.
Possible stroke symptoms include:
• Slurred speech • Loss of coordination • Facial drooping • Difficulty walking • Disorientation
If a driver is experiencing a stroke, they may fail field sobriety tests or appear impaired even though no alcohol or drugs are involved.
A stroke is a medical emergency, and quick medical attention is critical.
3. Diabetes and Diabetic Reactions
Diabetes is one of the most common medical conditions mistaken for DUI impairment.
Low blood sugar (hypoglycemia) can cause:
• Confusion • Sweating • Slurred speech • Dizziness • Erratic driving
High blood sugar can also lead to:
• Fatigue • Disorientation • Fruity breath odor
The fruity odor sometimes associated with high blood sugar can be mistaken for alcohol, which may lead officers to believe the driver has been drinking.
Because these symptoms can look like intoxication, diabetic drivers are sometimes mistakenly suspected of DUI.
4. Shock
A person in medical shock may show symptoms similar to intoxication. Shock can occur after a traumatic car accident, injury, or serious medical event.
Symptoms may include:
• Weak pulse • Pale or clammy skin • Confusion • Slow responses
Shock can occur after injury, illness, or severe stress and may create behavior that appears impaired to an officer conducting a roadside investigation.
5. Multiple Sclerosis
Multiple sclerosis (MS) is a neurological disorder that affects balance, coordination, and muscle control.
Symptoms may include:
• Unsteady walking • Poor coordination • Slurred speech • Tremors
These symptoms can easily be mistaken for alcohol impairment during roadside testing, especially during field sobriety tests that require balance and coordination.
6. Inner Ear Disorders
Inner ear conditions can cause significant balance problems that may mimic intoxication.
Symptoms may include:
• Vertigo • Dizziness • Difficulty standing or walking • Poor coordination
These balance issues can cause a driver to perform poorly on field sobriety tests even when completely sober.
Conditions like vestibular disorders or severe vertigo can make tasks such as standing on one leg or walking heel-to-toe extremely difficult.
7. Severe Fatigue
Extreme fatigue can also mimic impairment. This is sometimes seen in soldiers, shift workers, medical professionals, and truck drivers who work long hours with limited sleep.
A tired driver may exhibit:
• Slow reactions • Poor coordination • Bloodshot eyes • Difficulty concentrating
Officers are trained to consider fatigue as a possible explanation for signs that look like drug impairment.
In fact, studies have shown that severe sleep deprivation can impair reaction time similarly to alcohol intoxication.
8. Mental Health Conditions
Certain mental health disorders or psychological episodes can produce symptoms similar to intoxication.
Examples may include:
• Panic attacks • Psychosis • Severe depression • Anxiety or agitation
In some situations, individuals experiencing a mental health episode may display behavior that appears similar to drug impairment.
These situations can be complex and may require medical evaluation rather than criminal enforcement.
Why This Matters in a DUI Case
DUI investigations are rarely based on one single observation. Officers are trained to evaluate the totality of the circumstances when deciding whether impairment is present.
The totality of circumstances is used by the police officer to formulate probable cause to arrest for a DUI.
However, when medical conditions mimic intoxication, mistakes can happen.
A person may:
• Fail field sobriety tests • Appear confused or unsteady • Show physical symptoms that resemble drug use
Yet the true cause may be a medical condition rather than alcohol or drugs.
DUI Defense and Medical Conditions
When defending a DUI case, it is critical to examine whether the alleged signs of impairment could have been caused by something other than drugs or alcohol.
Medical records, expert testimony, and careful analysis of the investigation may reveal that:
• The driver was experiencing a medical episode • Field sobriety tests were unreliable under the circumstances • Officers misinterpreted symptoms of illness as intoxication
These issues can play an important role in defending DUI charges.
An experienced Utah DUI defense attorney may review body camera footage, medical records, and police reports to determine whether the officer misinterpreted a medical condition.
When medical conditions are involved, it can significantly affect the probable cause for arrest and the strength of the prosecution’s case.
Speak With a Utah DUI Defense Attorney
If you or someone you know has been arrested for DUI but was actually experiencing a medical condition, it is important to speak with an experienced attorney as soon as possible.
CALL/TXT JAKE GUNTER 📞 (801) 373-6345
An experienced DUI defense attorney can evaluate the evidence, investigate whether a medical condition was involved, and help protect your rights.
National Highway Traffic Safety Administration ARIDE program https://www.nhtsa.gov
Learn More About Criminal Defense Lawyer Jake Gunter
For additional insights on Criminal Defense Law and to get to know Jake Gunter better, check out these helpful videos:
- Meet Jake Gunter – Learn more about Jake Gunter's background, experience, and dedication to helping clients throughout Utah.
- How to Choose a Utah Personal Injury Attorney – This video offers guidance on selecting the right personal injury attorney to ensure you receive effective representation.
- What Jake Gunter Does and Who He Represents – Discover the types of cases Jake Gunter handles and how he advocates for the rights of injured individuals statewide.
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