Challenging Breathalyzer Results in California DUI Trials

Breathalyzer tests are a pivotal component of DUI investigations in California, providing a measure of a driver's blood alcohol concentration (BAC) at the time of the arrest. However, the results from these tests can be contested on several grounds, potentially impacting the outcome of a DUI trial. Understanding how to challenge breathalyzer results can be crucial for defending against DUI charges. This article explores various strategies and considerations for challenging breathalyzer results in California DUI trials.

Breathalyzers are devices used to estimate a person's BAC by measuring the amount of alcohol in their breath. The device operates on the principle that alcohol in the bloodstream evaporates into the lungs and is exhaled. The breathalyzer estimates BAC based on the concentration of alcohol in the breath sample.

Breathalyzers must be regularly calibrated and maintained to ensure accurate readings. If a device is not properly calibrated, it may produce erroneous results. Key points to challenge include:

• Calibration Records: Each breathalyzer has a calibration schedule that must be adhered to. If the device was not calibrated according to the manufacturer's specifications or did not undergo required maintenance, its results may be challenged.
• Maintenance History: In addition to calibration, breathalyzers require routine maintenance. A lack of proper maintenance can affect the device’s accuracy.

The accuracy of a breathalyzer test depends on proper administration. Any deviations from the correct procedures can undermine the test results. Common issues include:

• Timing of the Test: Breathalyzers should be administered at least 15 minutes after the driver’s last drink to ensure an accurate BAC reading. If the test was given too soon, alcohol that was still in the process of being absorbed into the bloodstream might skew the results.
• Procedure Adherence: Officers must follow specific protocols when administering the test, such as ensuring that the driver does not eat, drink, or vomit before the test. Deviations from these procedures can affect the test’s accuracy.

Certain medical conditions and external factors can influence breathalyzer readings, potentially leading to inaccurate results. Considerations include:

• Medical Conditions: Conditions such as acid reflux, diabetes, or other gastrointestinal issues can cause alcohol or acetone to appear in the breath, potentially affecting breathalyzer results.
• Environmental Factors: Environmental conditions, such as the presence of chemical fumes or excessive humidity, can also interfere with the accuracy of breathalyzer readings.

The reliability of breathalyzer results can be compromised if the device or the administering officer is not properly managed. Challenges in this area include:

• Officer Training: Officers must be trained to use breathalyzers correctly. If the officer administering the test lacked proper training or failed to follow the correct procedures, the results may be questionable.
• Device Malfunctions: Breathalyzers can malfunction or provide erroneous readings due to hardware or software issues. Demonstrating a history of malfunctions or problems with the device can be a basis for challenging the results.

Before the trial begins, your attorney may file pre-trial motions to challenge the admissibility of breathalyzer results. These motions may argue that the results should be excluded due to issues with calibration, maintenance, or administration.

During the trial, your attorney can cross-examine the officer who administered the breathalyzer test. Questions may focus on:

• Compliance with Protocols: Whether the officer followed proper procedures and administered the test according to established guidelines.
• Training and Experience: The officer’s level of training and experience with breathalyzer devices and their maintenance.

In some cases, presenting expert testimony can be beneficial. A forensic expert or toxicologist may provide testimony regarding the reliability of the breathalyzer device, potential sources of error, or the impact of medical conditions on the test results.

Your attorney can present alternative explanations for the breathalyzer results. For example, if medical conditions or external factors may have influenced the test, this information can be used to argue that the results are not a reliable indicator of impairment.

Challenging breathalyzer results in California DUI trials involves scrutinizing the accuracy of the device, the procedures followed, and the influence of external factors. By understanding the common grounds for challenging breathalyzer results and employing effective legal strategies, defendants can strengthen their defense and improve their chances of achieving a favorable outcome. Working with an experienced DUI attorney is essential for navigating these challenges and ensuring that your rights are protected throughout the legal process.