What Is a DUI Breathalyzer Test?
A DUI breathalyzer test is a breath-based device law enforcement uses to estimate a driver’s blood alcohol concentration (BAC). Officers use these devices during DUI investigations to measure alcohol levels from breath samples. The results often form the core evidence in Georgia DUI prosecutions. These devices are called either DWI breathalyzers or breath alcohol tests. Their purpose is the same – to determine if a driver exceeds the legal BAC limit.
In Georgia, the official evidentiary breath device is the Intoxilyzer 9000. Police stations and detention centers use this machine after a DUI arrest. Roadside handheld devices are known as preliminary breath testers (PBTs). Officers use them during traffic stops as screening tools. They carry far less legal weight than official tests. The governing statute for chemical testing in Georgia DUI cases is chemical breath testing, which sets the rules for how and when breath tests must be given.
Roadside Breath Test vs. Official DUI Blow Test
Georgia drivers encounter two very different breath tests during a DUI investigation. Many people confuse them. The legal consequences of each differ greatly.
The first is the roadside DUI blow test. This involves a handheld PBT device that an officer may offer during a traffic stop. This test is voluntary. You can decline it without triggering implied consent penalties. Results from the roadside PBT are generally not admissible at trial to prove your BAC. Officers use them mainly to build probable cause for a DUI arrest.
The second is the official post-arrest test on the Intoxilyzer 9000. After a lawful DUI arrest, the officer reads Georgia’s implied consent notice. He or she asks you to submit to this test. Refusing this test triggers serious consequences. You may lose your license for one year. The results from this test are admissible as evidence in court.
Understanding which test you face matters greatly. The roadside PBT is a field screening tool with limited legal significance. The Intoxilyzer 9000 test at the station carries real weight in your case.
How Breathalyzer Devices Measure BAC
Breath testing devices estimate BAC by analyzing the alcohol content in exhaled breath. The Intoxilyzer 9000 uses infrared spectroscopy. It passes infrared light through the breath sample. It measures how much light alcohol molecules absorb. The device then calculates a BAC reading based on that absorption pattern.
Older and handheld devices often use fuel cell technology instead. A chemical reaction between alcohol and a platinum electrode produces an electrical current. The stronger the current, the higher the estimated BAC. The specific instrument you blew into matters, because a handheld roadside screener and the station machine carry different evidentiary weight in Georgia courts, as explained in our guide to which breathalyzer Georgia police use.
Both technologies rely on a critical assumption: the 2,100:1 blood-to-breath ratio. The device assumes that 2,100 milliliters of breath air contain the same amount of alcohol as one milliliter of blood. The problem is that this ratio is a population average. Individual physiology varies significantly. Some people have ratios closer to 1,500:1. Others exceed 2,500:1. A person whose actual ratio is lower than 2,100:1 could get an artificially high BAC reading.
Georgia law requires specific safeguards to improve reliability. The testing operator must hold valid certification from the Georgia Bureau of Investigation (GBI). The device must be properly calibrated. It must follow the GBI Division of Forensic Sciences maintenance schedule. Before the test, the operator must watch the driver for 20 minutes without pause. Nothing must enter the mouth that could contaminate the sample.
Each of these requirements creates a potential failure point – and a potential avenue for defense.
Georgia Implied Consent and Refusing the Breathalyzer
Under implied consent to chemical testing, every person who drives on Georgia roads gives implied consent to chemical testing if lawfully arrested for DUI. This includes breath, blood, and urine tests. The implied consent law applies to the official post-arrest test only – not the roadside PBT.
If you refuse the official breath test after a DUI arrest, you face an automatic one-year administrative license suspension (ALS). The officer will confiscate your license and issue a temporary driving permit. Your refusal may also be introduced as evidence against you at trial. Prosecutors may argue that you refused because you knew you were intoxicated.
After a refusal or a test result of .08 or above, you have 30 calendar days to protect your driving privileges. You can request an ALS hearing to contest the suspension. You can also install an ignition interlock device on your vehicle. Missing this 30-day deadline may result in losing your ability to challenge the suspension.
Refusing the roadside PBT carries no implied consent penalty. There is no automatic suspension and no legal requirement to submit to the handheld device.
The decision to submit to or refuse a post-arrest breath test involves serious tradeoffs. Depending on your case circumstances, either choice could help or hurt your defense. You should consult a Georgia DUI attorney as quickly as possible after an arrest. You need to understand your options.
Common Reasons Breathalyzer Results Are Inaccurate
Breath test results are not infallible. Multiple factors can produce false or inflated BAC readings. Defense attorneys scrutinize these issues in every DUI case.
Residual mouth alcohol is one of the most common culprits. Mouthwash, breath sprays, and certain dental work such as bridges or dentures can trap alcohol in the mouth. This residual alcohol mixes with the breath sample and inflates the reading. The reading exceeds the driver’s actual BAC.
GERD, acid reflux, and recent vomiting create similar problems. These conditions push alcohol-laden stomach contents into the mouth and throat. They contaminate the breath sample. If the driver burped or vomited during the required 20-minute observation period, the result may be unreliable. If the officer failed to notice or restart the clock, the problem grows worse.
Improper calibration or maintenance of the Intoxilyzer 9000 can produce skewed results. The GBI Division of Forensic Sciences maintains calibration records for every device in service across Georgia. Defense attorneys can subpoena these records. You can determine whether the specific machine used in your test was functioning properly at the time.
Medical conditions also interfere with accuracy. People with diabetes may produce acetone in their breath. Those following ketogenic diets may do the same. Some breathalyzer devices mistake acetone for ethanol. This results in a falsely elevated reading.
Environmental contaminants such as paint fumes, cleaning chemicals, or industrial solvents in the testing area can affect readings. The testing environment must be free of airborne alcohol and chemical contaminants.
Operator error rounds out the list. If the officer lacked valid certification, the results may be challengeable. If he or she failed to follow proper testing protocol, the results may be challengeable. If he or she did not complete the full 20-minute observation period, the results may be challengeable in court.
How a Georgia DUI Attorney Can Challenge Breathalyzer Evidence
A BAC reading above .08 does not automatically mean a conviction. Skilled defense attorneys use multiple strategies to challenge breath test evidence.
One foundational approach involves filing motions to suppress the breath test results entirely. If the officer lacked probable cause for the traffic stop or arrest, the test results may be inadmissible. This applies regardless of the number shown. Courts require that every step leading to the chemical test be legally justified.
Attacking the 20-minute observation period is another effective strategy. Breath test results are frequently challengeable when officers fail to follow the required observation protocol. In one Georgia DUI case our firm handled, the arresting officer left the observation room. He completed paperwork during the mandatory waiting period. This gap became central to the suppression motion.
Defense attorneys also subpoena the Intoxilyzer 9000’s calibration and maintenance logs from the GBI. Gaps in maintenance records cast doubt on accuracy. Overdue calibration dates do the same. In another case, our firm discovered that the device used in a client’s test had missed its scheduled calibration by several weeks. The prosecution had not disclosed this fact.
Questioning the operator’s certification is equally important. Georgia requires that only certified operators administer the Intoxilyzer 9000 test under chemical breath testing. If the officer’s certification had lapsed at the time of testing, the results may be excluded.
Expert testimony on partition ratio variation can also create reasonable doubt. A toxicology expert can explain that the driver’s individual physiology may have produced an artificially high reading. This happens when the partition ratio differs from the assumed 2,100:1 standard.
Finally, identifying procedural violations in how the implied consent notice was read provides additional grounds for challenge. Violations in how the test was administered do the same. Even small deviations from required protocol can open the door for a defense motion.
Frequently Asked Questions About DUI Breathalyzer Tests
Can I refuse a breathalyzer test in Georgia?
You can refuse the roadside PBT without legal penalty. However, refusing the official post-arrest breath test triggers Georgia’s implied consent law under implied consent to chemical testing. An automatic one-year administrative license suspension follows. Your refusal may also be used as evidence against you at trial. You have 30 days to request a hearing or install an ignition interlock device to protect your driving privileges.
How accurate are DUI breathalyzer tests?
Breathalyzer devices provide estimates, not exact measurements. Their accuracy depends on proper calibration, certified operation, and the absence of interfering factors. Residual mouth alcohol, acid reflux, and certain medical conditions can all affect results. The assumed 2,100:1 partition ratio does not apply equally to every person. Depending on the specific circumstances, a BAC reading may overstate or understate a driver’s true blood alcohol level.
What is the difference between a roadside blow test and an official breathalyzer test?
The roadside blow test uses a handheld PBT device during a traffic stop. It is voluntary and generally not admissible to prove BAC at trial. The official breathalyzer test uses the Intoxilyzer 9000 at a police station after arrest. It falls under Georgia’s implied consent law. Its results are admissible as evidence. Refusing the official test carries license suspension consequences. Refusing the roadside device does not.
Can a breathalyzer result be thrown out in court?
Breathalyzer results can be suppressed or challenged in court. Common grounds include lack of probable cause for the arrest, failure to observe the 20-minute waiting period, and lapsed operator certification. Improper device calibration and medical conditions that produce false readings are also grounds. A Georgia DUI attorney can review the specific facts of your case. You can identify viable challenges.
Charged After a Breathalyzer Test? Speak With a Georgia DUI Defense Attorney
A breath test result above .08 is not automatic proof of guilt. The team at Kohn & Yager LLC regularly challenges breathalyzer evidence in state, superior, and municipal courts across Georgia. We know how to investigate calibration records and identify observation period failures. We build suppression motions that target the weaknesses in breath test evidence.
If you refused the breath test, the clock is already running. You have just 30 days from your arrest to request an ALS hearing or install an ignition interlock device. You need to protect your license. Missing that deadline can result in losing your ability to challenge the suspension.
Contact Kohn & Yager LLC today for a free consultation. We will review the details of your DUI arrest and evaluate the breath test evidence against you. We will explain your defense options. Every case is different. The strength of a breathalyzer challenge depends on the specific circumstances. You deserve an attorney who knows where to look.
