Challenging Breathalyzer Results in Nashville DUI Cases

Breathalyzer tests are a common tool used by law enforcement to determine blood alcohol concentration (BAC) levels in individuals suspected of driving under the influence (DUI) in Nashville. However, challenging the accuracy and reliability of breathalyzer results can be a crucial aspect of building a strong defense in DUI cases. In this blog post, we’ll explore strategies for contesting breathalyzer evidence in Nashville DUI cases, providing valuable insights for individuals facing DUI charges.

Understanding Breathalyzer Technology

Before delving into strategies for challenging breathalyzer evidence, it’s essential to understand how breathalyzer devices work. Breathalyzers measure the amount of alcohol in a person’s breath by analyzing the alcohol content in exhaled air. While breathalyzer devices are commonly used by law enforcement, they are not infallible and can be subject to various factors that may affect the accuracy of results.

Challenging Calibration and Maintenance Records

Breathalyzer devices require regular calibration and maintenance to ensure accurate readings. In Nashville DUI cases, attorneys may challenge breathalyzer results by scrutinizing the calibration and maintenance records of the device used during testing. If there are discrepancies or irregularities in the maintenance logs or if the device was not properly calibrated, the accuracy of the breathalyzer results may be called into question.

Questioning Officer Training and Administration of Tests

The proper administration of breathalyzer tests is crucial for obtaining reliable results. Attorneys may challenge breathalyzer evidence by questioning the training and experience of the arresting officer responsible for administering the test. If the officer failed to follow proper procedures or lacked sufficient training in breathalyzer testing, the validity of the results may be challenged in court.

Exploring Physiological Factors

Several physiological factors can influence breathalyzer results and lead to inaccuracies in BAC readings. Factors such as acid reflux, mouth alcohol, and certain medical conditions can affect the concentration of alcohol detected by breathalyzer devices. Attorneys may explore these physiological factors and present evidence to the court to challenge the reliability of breathalyzer results in Nashville DUI cases.

Utilizing Expert Witnesses

In complex DUI cases involving breathalyzer evidence, attorneys may enlist the expertise of forensic experts to analyze the reliability of breathalyzer results. Forensic experts can review the circumstances of the breathalyzer test, evaluate potential sources of error, and provide expert testimony in court. Their analysis and testimony can bolster the defense’s argument and cast doubt on the accuracy of breathalyzer evidence.


Challenging breathalyzer evidence is a crucial aspect of building a strong defense in Nashville DUI cases. By understanding the technology behind breathalyzer devices, questioning calibration and maintenance records, challenging officer training and administration of tests, exploring physiological factors, and utilizing expert witnesses, individuals facing DUI charges can effectively contest breathalyzer evidence and seek a favorable outcome in their case. With skilled legal representation and strategic defense tactics, individuals can navigate the complexities of DUI defense and protect their rights in Nashville courts.