Driving While Intoxicated (DWI) charges in Texas carry severe penalties that can impact your personal and professional life. A conviction can result in hefty fines, license suspension, increased insurance rates, and even jail time. Given the high stakes, it is crucial to examine every piece of evidence presented by the prosecution, including the results of a breathalyzer test.

Law enforcement officers commonly use breathalyzer tests to determine a driver’s Blood Alcohol Concentration (BAC). While these tests are often seen as definitive proof of intoxication, they are not always accurate. Several factors can contribute to false readings, including improper calibration, officer error, medical conditions, and even environmental influences. Challenging the reliability of a breathalyzer test can be a key defense strategy in a DWI case.

If you are facing DWI charges, seeking legal representation is essential. A skilled DWI attorney in Fort Worth, Texas like Cole Paschall Law can help you contest the validity of breathalyzer results, expose weaknesses in the prosecution’s case, and work toward reducing or dismissing the charges against you.

Understanding the limitations of breathalyzer tests and knowing how to challenge them effectively can significantly affect the outcome of your case.

Understanding Breathalyzer Tests

Breathalyzer tests measure the concentration of alcohol in a person’s breath to estimate their Blood Alcohol Concentration (BAC). The device detects alcohol in the deep lung air and converts that measurement into a BAC percentage. 

In Texas, a BAC of 0.08% or higher is considered legally intoxicated for drivers aged 21 and over. Commercial drivers have a lower limit of 0.04%, while underage drivers are subject to a zero-tolerance policy.

There are two main types of breathalyzer tests used in Texas DWI cases:

1. Preliminary Breath Tests (PBTs): These handheld devices are used by officers at traffic stops to assess whether a driver has consumed alcohol. While they can indicate the presence of alcohol, their results are not always admissible in court due to their lack of precision.

2. Evidential Breath Tests (EBTs): These more sophisticated breathalyzers, such as the Intoxilyzer 9000 used in Texas, provide results that can be used as evidence in court. However, even these machines have limitations and must be properly maintained and operated to ensure accuracy.

Breathalyzer results are often treated as primary evidence in DWI cases. However, their accuracy depends on multiple factors, and understanding how they work can provide a foundation for challenging their reliability in court. 

Errors in device maintenance, test administration, medical conditions, and environmental factors can all lead to incorrect BAC readings, potentially resulting in wrongful DWI charges.

Common Issues with Breathalyzer Accuracy

1. Device Calibration and Maintenance

Breathalyzers require regular calibration and maintenance to function correctly. If the device is not properly maintained, it can produce inaccurate readings. Law enforcement agencies must follow strict protocols for maintaining and calibrating breathalyzer devices, but errors can occur. A Fort Worth DWI attorney can investigate whether the device used in your case was properly maintained and calibrated.

2. Improper Administration of the Test

Officers must follow specific procedures when administering a breathalyzer test. If an officer fails to follow these procedures, the results may be unreliable. Some common mistakes include:

• Not observing the driver for the required 15-minute observation period before administering the test
• Instructing the driver improperly on how to blow into the device
• Using a contaminated or malfunctioning breathalyzer

3. Medical Conditions and Diet

Certain medical conditions and dietary habits can interfere with breathalyzer results. For example:

• Acid reflux, GERD, or diabetes can cause alcohol-like compounds to be present in the breath, leading to false positives.
• Low-carb or ketogenic diets can produce acetone, which some breathalyzers may mistakenly detect as alcohol.
• Certain medications can affect breath test results, including asthma inhalers and mouthwashes containing alcohol.

4. Mouth Alcohol Contamination

Residual alcohol in the mouth, rather than in the bloodstream, can lead to inflated BAC readings. Common causes include:

• Recent consumption of alcohol
• Using mouthwash or breath sprays containing alcohol
• Acid reflux or regurgitation of stomach contents

If mouth alcohol contamination is suspected, a DWI attorney in Fort Worth, Texas, can argue that the test results should not be used as evidence.

5. Environmental Factors

Breathalyzer readings can be affected by external environmental factors. For example:

• Exposure to certain chemicals (e.g., paint thinners, gasoline, or cleaning solvents) can lead to false positives.
• Radiofrequency interference (RFI) from police radios or other electronic devices can affect breathalyzer function.

Legal Strategies to Challenge Breathalyzer Results

A knowledgeable DWI attorney in Fort Worth, Texas, can use several legal strategies to challenge breathalyzer results in court. These include:

1. Questioning the Reliability of the Breathalyzer Device

Your attorney can request maintenance and calibration records for the breathalyzer used in your test. If there is evidence of improper maintenance, the test results may be deemed unreliable.

2. Challenging Officer Training and Test Administration

If the arresting officer did not follow proper procedures when administering the breath test, your lawyer can argue that the results should be excluded from evidence.

3. Introducing Alternative Explanations for BAC Levels

Medical conditions, diet, or environmental factors can lead to inaccurate BAC readings. Your attorney can present expert testimony to explain how these factors may have influenced the test results.

4. Requesting Independent Testing

If you provide a breath sample, your lawyer may request a blood test to compare the results. Blood tests are generally more accurate and can provide a stronger defense.

5. Arguing a Violation of Your Rights

If the officer did not have probable cause to stop you or failed to inform you of your rights, your attorney may be able to get the breath test results suppressed.

The Importance of Hiring an Experienced DWI Attorney

Challenging a breathalyzer result requires legal knowledge and expertise. An experienced DWI attorney in Fort Worth, Texas, understands the technical aspects of breathalyzer testing and can identify weaknesses in the prosecution’s case.

Potential Consequences of a DWI Conviction

A DWI conviction in Texas can have serious consequences, including:

• Fines and court costs
• License suspension or revocation
• Mandatory alcohol education programs
• Increased insurance rates
• Possible jail time

By working with a skilled attorney, you can increase your chances of reducing or dismissing your charges.

Contact a Fort Worth DWI Attorney 

If you are facing DWI charges, do not assume that breathalyzer results are absolute proof of intoxication. A knowledgeable DWI attorney in Fort Worth, Texas, can help you challenge the validity of the breath test and protect your rights. Contact a legal professional to discuss your case and explore your defense options.

Taking immediate action can improve your chances of securing a favorable outcome in your DWI case.