Breathalyzer tests often come up during DUI stops in McHenry County, Illinois. Police use breath testing to estimate a driver’s blood alcohol concentration and gather evidence during an investigation. Many drivers assume the machines are always accurate or that they must take every test an officer requests. Illinois law is more nuanced than that. Different devices serve different purposes. The law treats roadside breath tests differently from station testing.
The decision to take or refuse a breath test can affect both a DUI case and your driver’s license. The attorneys at Nold & Walsh, LLC, represent drivers throughout McHenry County, Illinois, in DUI cases, including cases where breath tests or refusals are a key component. Contact our law firm today to discuss your situation and learn what options may exist in your case.
Illinois law prohibits driving with a blood alcohol concentration of 0.08% or higher. Police may also pursue a DUI case if they believe alcohol or drugs impaired a driver, even without a specific BAC result.
Officers often begin a DUI investigation after observing driving behavior or signs of alcohol use during a traffic stop. Slurred speech or difficulty following instructions may lead an officer to continue the investigation. They may then conduct sobriety tests. Breath testing is often part of that process.
Two different types of breath testing are often used in Illinois DUI investigations. One type occurs at the roadside using a portable device. Officers use these handheld machines to obtain a quick estimate of a driver’s BAC during the stop.
The second type takes place after an arrest at the police station. Larger evidentiary machines analyze breath samples and produce results that prosecutors may try to introduce in court.
Illinois law treats roadside screening differently from evidentiary testing. Our law firm’s DUI defense attorneys can review your case and explain which types of evidence are likely to be admissible in court.
Portable breath tests, or PBTs, are small handheld machines officers use during traffic stops to estimate a driver’s blood alcohol concentration quickly. They provide a fast reading that can help officers determine whether further investigation is necessary. Officers use PBT results to make immediate decisions during a stop. They can:
The law in Illinois treats PBT results differently from evidentiary testing. Courts generally limit how these readings can be used in criminal proceedings. PBT results may help establish probable cause but are often inadmissible as proof of intoxication at trial.
Many drivers assume they must take roadside breath tests when requested. While officers may strongly encourage you to comply with the test, Illinois law does not treat portable screenings the same as official station testing. A lawyer at our law firm can help you understand your rights and obligations.
After an arrest, officers may ask you to take a station breath test using an evidentiary machine. These larger instruments, commonly the Intoxilyzer 8000, are approved by the Illinois State Police and designed to produce results that can be introduced in court. These tests:
However, Illinois law sets strict standards for test admissibility. Not every breath test can be used in court. For example:
Following procedures is critical because errors can affect how accurate the test is, and whether it will come into evidence later. Even small deviations from the required protocols may undermine the prosecution’s case. For example, an attorney from our law firm can use indications that police cut corners to challenge the admissibility of any evidence they uncovered while doing so.
Breath test results are often key evidence in DUI cases, but they’re not infallible. Illinois law sets strict rules for how to conduct tests. Our lawyers look for:
Challenging breath test evidence is just one part of our broader defense approach. By identifying procedural and related problems, our law firm can challenge how reliable the prosecution’s evidence really is—and use that information to protect your rights and record.
When an officer asks you to take a breath test, it can feel stressful, but understanding your options helps you respond without making the situation worse. Illinois law gives drivers certain rights and responsibilities after a DUI arrest, so knowing the difference between test types and the consequences of refusal is important. Here’s what to do:
Refusing a breath test is often the safer option. Refusal triggers an automatic license suspension, but it avoids creating extra evidence that prosecutors can use against you in court. Prosecutors may use your refusal as evidence that you knew you were breaking the law. However, any breath, blood, or urine evidence can be challenged later. The key is to hire an experienced DUI defense law firm as soon as possible.
The attorneys at Nold & Walsh, LLC, can review the stop and test and raise challenges to protect your rights, whether you submitted to testing or not.
Refusing a test is often the smarter choice, but our lawyers will look for any possible way to challenge your DUI charges. Contact the attorneys at Nold & Walsh, LLC, to find out how we can help. From our office location in Crystal Lake, we help clients throughout McHenry County and the surrounding areas of Illinois.
