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July 3, 2024

Will County, Illinois DUI Field Sobriety Tests

In Will County, Illinois, understanding the implications of these tests, your rights, and the science behind them can significantly impact the outcome of such encounters. This blog will delve into what field sobriety tests entail, their reliability, and how you can legally respond during a DUI stop.

Understanding Field Sobriety Tests

Field Sobriety Tests (FSTs) are a series of physical and cognitive exercises that officers use to assess impairment. The most common tests include the Horizontal Gaze Nystagmus (HGN), the Walk-and-Turn, and the One-Leg Stand. Each test is designed to evaluate balance, attention level, and eye tracking, which can be difficult for someone under the influence of alcohol or drugs.
Legal Standing of Field Sobriety Tests in Illinois
In Illinois, law enforcement officers use FSTs to establish probable cause for a DUI arrest. However, it’s important to note that these tests are not mandatory. You have the legal right to refuse to perform field sobriety tests without direct penalties, such as fines or criminal charges, though refusal can lead to further investigative steps by the officer, including arrest based on other observed evidence of impairment.

Reliability and Criticisms of Field Sobriety Tests

The reliability of FSTs has been a subject of debate. According to research published by the National Highway Traffic Safety Administration (NHTSA), the accuracy of these tests can vary. For instance, the HGN test has a reported accuracy of 77%, the Walk-and-Turn 68%, and the One-Leg Stand 65% when administered under ideal conditions (NHTSA).
Critics argue that factors such as nervousness, medical conditions, and even road conditions can affect performance on these tests, leading to false positives. Scholarly articles, such as those found in the Journal of Forensic Sciences, highlight concerns about the subjective interpretation of results by officers and the lack of consideration for non-alcohol-related impairments (Journal of Forensic Sciences).

Your Rights and How to Respond

If stopped for a DUI in Will County, you can politely refuse to perform FSTs. This decision should be made carefully, as officers may rely on other evidence to justify an arrest. If you choose to submit to the tests, remember that the results are not definitively indicative of impairment and can be contested in court with the help of a knowledgeable DUI attorney.
The Importance of Legal Representation
Should you find yourself subjected to a field sobriety test in Will County, consulting with a DUI attorney is crucial. An experienced lawyer can challenge the administration and results of the tests, potentially mitigating the consequences or even leading to a dismissal of charges. Legal expertise is vital, as a qualified attorney will understand how to leverage scientific and procedural criticisms of FSTs effectively.


Field sobriety tests are a common but controversial tool in DUI enforcement. In Will County, Illinois, knowing how to handle such tests during a DUI stop is critical. By understanding your rights and the inherent limitations of FSTs, and by seeking competent legal advice, you can better navigate the complexities of DUI procedures and protect your rights under the law.
For further assistance or if you face DUI charges, it’s advisable to contact Andy Sotiropoulos, a defense attorney who specializes in DUI law in Will County, to ensure your rights are defended effectively and your case is handled with care.


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