If a police officer pulls you over in Rockford on suspicion of driving under the influence (DUI), you may hear them ask you to perform a field sobriety test. These tests are designed to help officers determine whether you are impaired by alcohol or drugs. Common tests include walking in a straight line or following a moving object with your eyes. But the key question is: are you legally required to comply? What happens if you don’t?
Illinois Law on Field Sobriety Tests
Under Illinois law, you are not legally required to submit to voluntary field sobriety tests. These tests are considered “preliminary.” They’re separate from chemical tests like breath, blood, or urine tests, which may be required under the state’s implied consent laws. Officers may use field sobriety tests to gather evidence or justify an arrest, but refusing to participate in these roadside exercises cannot, by itself, result in a criminal penalty.
However, the police may try to frame field sobriety tests as mandatory. They might suggest that refusal will automatically lead to arrest. While refusal may influence an officer’s decision to make a DUI arrest, it’s not against the law.
Why Police Ask You to Take These Tests
Field sobriety tests are supposed to detect signs of impairment, but they’re not foolproof—or even scientific. Officers may look for:
• Loss of balance or coordination
• Trouble following instructions
• Swaying or other physical signs of intoxication
These observations can be combined with chemical testing and other evidence. For example, they may have witnessed erratic driving, slurred speech, or smelled alcohol or drugs. However, mistakes can happen. Your performance can be influenced by factors unrelated to alcohol or drugs, like medical conditions or fatigue.
The Drawbacks of Performing Field Sobriety Tests
Performing a field sobriety test can be risky. If your performance seems impaired, it will be used as evidence against you in court. Officers may take poor balance and minor missteps as evidence that you’re intoxicated. Even if you feel fine, nerves or a physical condition can affect your abilities.
Because the results are used as probable cause for arrest, participating can sometimes work against you. Many attorneys advise that refusing voluntary roadside tests can help preserve your legal options, although it may make the officer more suspicious.
Field Sobriety Test Refusal vs. Chemical Testing Obligations
While you can legally refuse field sobriety tests, Illinois requires drivers suspected of DUI to submit to chemical testing under the state’s implied consent law. This applies to breath, blood, or urine tests. Refusing a chemical test can result in:
• Automatic driver’s license suspension
• Possible penalties and fines
• Potential evidence used against you in court
The difference between these tests is key. One is optional, the other has mandatory consequences under state law.
Practical Tips if You Are Asked to Take a Field Sobriety Test
Knowing your rights and responding appropriately can protect you during a traffic stop. Politely decline voluntary field sobriety tests. You can say, “I decline to perform field sobriety tests.”
Do not argue or resist if you’re asked to take a preliminary breath test or if you’re arrested. Compliance with officers during a stop is required, but you may decline voluntary tests without penalty. Remember that your refusal may be noted in the officer’s report and could influence their decision to arrest, but it is not illegal.
Get Legal Guidance from a Rockford DUI Defense Attorney
If you are facing a DUI charge in Rockford, working with a skilled attorney can help protect your legal rights and fight back against charges. Contact The Law Office of Joshua C Smith, P.C. to discuss your case.