A DUI arrest can leave you worried about your driving privileges, employment, finances, and what may happen in court. When a breath-test result is part of the evidence, it can be easy to assume that the number on the device settles the case. It does not necessarily tell the entire story. California DUI cases involve specific procedures for collecting and evaluating breath samples, and the circumstances surrounding a test may matter when determining how much weight the result should receive.
How California Breath Testing Works
Breath tests are used to estimate a person’s blood alcohol concentration (BAC) by analyzing alcohol in the breath. California law enforcement agencies must follow established procedures when administering these tests, including requirements concerning the equipment, testing process, and observation period. For evidentiary breath testing, California Highway Patrol procedures call for continuous observation for at least 15 minutes before the breath sample is collected, during which the person should not eat, drink, smoke, or vomit.
The circumstances surrounding the test can therefore be important. A DUI defense attorney may examine the testing records and other evidence to determine whether required procedures were followed.
Key Factors That May Affect a Breath-Test Result
A breath-test number should be evaluated in the context of how the test was performed and documented. Several factors may warrant closer examination:
- Observation period: The required observation period can be reviewed to determine whether the proper conditions existed before the sample was collected.
- Equipment and calibration: Testing equipment must meet applicable standards, and records concerning its operation, maintenance, and calibration may be relevant when evaluating a result.
- Testing procedures: The officer’s actions, instructions, documentation, and compliance with required testing procedures can affect how the evidence is evaluated.
These issues do not automatically invalidate a breath test. Instead, they can provide important information for assessing the reliability and evidentiary weight of the reported BAC.
Reviewing the Circumstances Behind the Test
A breath-test result is only one part of a DUI investigation. The events leading up to the test may also provide important context for evaluating the prosecution’s evidence. An attorney may review the traffic stop, the officer’s observations, field sobriety testing, statements, and the timeline between driving and chemical testing.
The timing of a breath test can be particularly relevant when considering what the result actually represents. Other evidence may help establish whether the reported BAC accurately reflects the circumstances at the time of driving. Reviewing the entire investigation rather than focusing on a single number can provide a more complete picture of the case.
Questions to Ask About Breath-Test Evidence
If a breath test is being used against you, several questions may help identify areas that require further investigation:
- Was the equipment properly maintained? Records may provide information about the device’s condition and compliance with applicable requirements.
- Was the test properly administered? The testing process can be compared with applicable California procedures.
- Are the records consistent? Reports, test results, maintenance records, and other documentation may reveal inconsistencies that deserve closer examination.
California courts recognize that failures to follow applicable testing regulations can affect how breath-test evidence is evaluated, making the underlying records and circumstances important parts of a DUI defense review.
Challenging Breath-Test Evidence in a DUI Case
Challenging a breath test does not necessarily mean arguing that the device was simply “wrong.” A defense may instead focus on whether the test was properly administered, whether the equipment met applicable requirements, and whether the surrounding evidence supports the reported result. Depending on the facts, these questions may become relevant during negotiations, pretrial proceedings, or trial.
The Law Offices of Virginia L. Landry, Inc. focuses its practice on DUI defense in Orange County. Virginia L. Landry is Board Certified in DUI Defense Law, with a practice centered on DUI and related driving offenses, including issues involving breath and blood testing.
Protecting Your Rights After a DUI Arrest
A breath-test result can be an important piece of a DUI case, but it should not be considered in isolation. Promptly reviewing the testing records, arrest report, and other evidence can help identify questions that may affect how the case is handled. Contact Law Offices of Virginia L. Landry, Inc. through the firm’s website to discuss the circumstances of your Orange County DUI arrest and learn what legal options may be available, or reach out at (949) 694-8804.