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The Role of Field Sobriety Tests in DWI Arrests
John D.
Getting pulled over on suspicion of drunk driving can be a nerve-wracking experience. Your heart races, your palms sweat, and suddenly you’re being asked to step out of your vehicle to perform a series of physical tests on the side of the road. These are field sobriety tests, and they play a crucial role in determining whether you’ll face DWI charges. Understanding what these tests are, how they work, and what rights you have during this process can make a significant difference in protecting yourself legally.
Field sobriety tests have become a standard tool for law enforcement officers across the country when they suspect a driver is under the influence. However, many people don’t realize that these tests are far from foolproof, and various factors can affect their accuracy. Let’s explore how these tests actually work and what you need to know if you ever find yourself in this situation.
What Are Field Sobriety Tests?
Field sobriety tests are physical and cognitive exercises that police officers use to assess whether a driver is impaired by alcohol or drugs. These tests are typically administered during a traffic stop when an officer notices signs of potential intoxication, such as erratic driving, the smell of alcohol, or slurred speech.
The primary purpose is to give officers probable cause to make an arrest or request a chemical test like a breathalyzer. Officers look for specific indicators during these tests that suggest impairment, including balance issues, inability to follow instructions, and poor coordination.
The Three Standardized Field Sobriety Tests
The National Highway Traffic Safety Administration has approved three standardized tests that officers commonly use:
Horizontal Gaze Nystagmus (HGN)
This test involves an officer observing your eyes as you follow a moving object, usually a pen or flashlight. The officer looks for involuntary jerking of the eyeball, which becomes more pronounced when a person is intoxicated. You’ll be asked to follow the object with your eyes while keeping your head still.
Walk-and-Turn Test
You’ll be instructed to take nine heel-to-toe steps along a straight line, turn on one foot, and return in the same manner. Officers watch for signs like stepping off the line, using arms for balance, taking the wrong number of steps, or turning incorrectly.
One-Leg Stand Test
This test requires you to stand with one foot approximately six inches off the ground and count aloud until told to stop, typically for about 30 seconds. Officers look for swaying, using arms for balance, hopping, or putting your foot down.
Non-Standardized Tests Officers May Use
Beyond the three standardized tests, officers sometimes employ additional exercises:
- Finger-to-nose test
- Reciting the alphabet
- Counting backwards
- Romberg balance test (standing with feet together and head tilted back)
These non-standardized tests have less scientific backing and are more subjective in their assessment. Courts may view results from these tests with more skepticism compared to the standardized versions.
Factors That Can Affect Test Results
Field sobriety tests aren’t always accurate indicators of intoxication. Several legitimate factors can cause you to fail even when you’re completely sober.
Physical and Medical Conditions
Inner ear problems, leg injuries, back issues, and neurological conditions can significantly impact your balance and coordination. Being overweight or elderly can also make certain physical tasks more challenging. If you have any medical conditions that affect your mobility, these tests may not accurately reflect your level of impairment.
Environmental Conditions
Performing these tests on an uneven road surface, in poor lighting, or during bad weather creates additional challenges. Gravel, ice, rain, or even poorly maintained pavement can cause anyone to stumble regardless of sobriety. Officers are supposed to find suitable locations for testing, but this doesn’t always happen.
Footwear and Clothing
High heels, flip-flops, or bulky clothing can make balance tests nearly impossible to complete successfully. Women wearing heels are particularly disadvantaged during these assessments.
Your Rights During Field Sobriety Testing
Many drivers don’t realize they have options when asked to perform field sobriety tests. In most states, these tests are voluntary, meaning you can refuse to take them without automatic penalties. However, refusing may lead to arrest based on other observations the officer has made. Understanding the difference between field sobriety tests and chemical tests is important.
While field tests are typically voluntary, refusing a breathalyzer or blood test after arrest can result in license suspension under implied consent laws in most states. You have the right to politely decline field sobriety tests, though you should be respectful when doing so. Simply state that you prefer not to participate in the tests.
How Test Results Are Used in Court?
Prosecutors often rely heavily on field sobriety test results to build their DWI cases. Officers will testify about your performance during these tests, describing every misstep or sign of impairment they observed. Video footage from dashboard or body cameras may be presented as evidence.
However, skilled defense attorneys can challenge these results effectively. They may question the officer’s training and administration of the tests, highlight environmental factors that affected performance, or present medical evidence explaining why you struggled with certain tasks. The subjective nature of these tests leaves room for reasonable doubt.
Common Mistakes Officers Make
Law enforcement officers must follow specific protocols when administering field sobriety tests. Deviations from these standards can compromise the validity of the results. Officers sometimes fail to properly explain instructions, conduct tests in unsuitable locations, or don’t account for physical limitations.
Some rush through the evaluation process or allow distractions to interfere. When officers don’t follow proper procedures, the test results may be challenged or thrown out entirely in court. Documentation is another area where mistakes occur. If an officer’s written report contradicts video evidence or contains inconsistencies, it can undermine the prosecution’s case.
Conclusion
Field sobriety tests remain a cornerstone of DWI enforcement, but they’re far from perfect indicators of impairment. These tests can be influenced by numerous factors beyond alcohol consumption, from medical conditions to weather and road conditions. An experienced attorney can examine every detail of your stop and testing procedure to identify weaknesses in the prosecution’s case. L& L Law Group specializes in DWI defense and can provide the skilled representation you need to protect your rights and fight for the best possible outcome.
