Many people assume a breath test result is indisputable evidence in a DWI case. Prosecutors often present breathalyzer results as scientific proof of intoxication, and jurors may view those numbers as objective and reliable.
The reality is more complicated.
Breath-testing machines require regular maintenance, proper calibration, trained operators, and compliance with testing procedures. If any part of that process breaks down, questions may arise regarding the reliability of the reported result.
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Breath-Testing Machines Require Regular Maintenance
A breath-testing instrument is only as reliable as its maintenance history.
Arkansas requires evidentiary breath-testing equipment to undergo routine inspection, calibration, and maintenance. These procedures help ensure the machine continues producing accurate and reliable measurements.
When questions arise about a breath test result, maintenance records often become important evidence.
Those records may include:
- Calibration logs
- Maintenance records
- Inspection reports
- Quality-control documentation
A machine that was not properly maintained may raise questions about the reliability of the reported result.
The Operator Must Be Properly Certified
The machine itself is only one part of the equation.
The individual administering the test must also follow required procedures and possessthe appropriate training and certification.
Questions may arise when an operator:
- Lacks proper certification
- Has expired credentials
- Fails to follow testing procedures
- Deviates from established protocols
Because breath-testing procedures are highly technical, proper training remains an important part of the process.
The Observation Period Matters
Arkansas breath-testing procedures require an observation period before an evidentiary breath sample is collected.
During this period, the individual being tested should not:
- Eat
- Drink
- Smoke
- Place objects in the mouth
- Burp or regurgitate
The purpose of the observation period is to reduce the risk of contamination that could affect the sample.
If questions exist regarding whether the observation period was properly conducted, those issues may become relevant when evaluating the reliability of the test.
Medical Conditions Can Affect Breath Test Results
Many people do not realize that certain medical conditions may influence breath-testing results.
Examples sometimes discussed in DWI litigation include:
- Gastroesophageal reflux disease (GERD)
- Acid reflux
- Diabetes
- Certain respiratory conditions
These issues do not automatically invalidate a breath test. However, they may become relevant when evaluating how the result was obtained and whether outside factors affected the reading.
Environmental Factors May Also Play a Role
Breath-testing devices operate in real-world environments rather than laboratory conditions.
Potential concerns sometimes raised in breath-testing cases include:
- Radio frequency interference
- Temperature variations
- Mechanical issues
- Human error during administration
Because every case is unique, the significance of these factors depends on the surrounding facts and available evidence.
Does the Result Match the Rest of the Evidence?
A breath-test result rarely exists in isolation.
Investigators also examine:
- Driving behavior
- Officer observations
- Field sobriety tests
- Video recordings
- Witness statements
Occasionally, questions arise when a reported BAC result appears inconsistent with other observations documented during the investigation.
For example, a very high BAC reading may prompt additional scrutiny if the accompanying reports describe few or no indicators commonly associated with significant impairment.
Scientific Evidence Still Requires Scrutiny
Breath-test evidence can be powerful, but it is not immune from examination.
Like any scientific process, the reliability of the result depends on proper equipment, proper procedures, and proper administration.
Understanding how a result was obtained is often just as important as the number itself.
We Simply Win
A DWI case involves more than a single number on a printout. Breath-testing records, maintenance history, certification records, and testing procedures may all become important pieces of evidence.
At Ludwig Law Firm, attorneys Harry Warden and Kale Ludwig prepare every case as if it is going to trial. If you are facing a DWI charge in Little Rock or anywhere in Arkansas, contact Ludwig Law Firm at 501-868-7500 or visit ludwiglawfirm.com.
Frequently Asked Questions About Breathalyzer Accuracy
How often are breath-testing machines calibrated?
Arkansas requires evidentiary breath-testing instruments to undergo regular maintenance and quality-control procedures to help ensure accuracy.
Can a breath test be challenged?
Breath-test evidence may be examined for issues involving maintenance, calibration, certification, testing procedures, and other factors affecting reliability.
Does the officer need special training to administer a breath test?
Arkansas requires individuals administering evidentiary breath tests to follow established procedures and certification requirements.
Why is the observation period important?
The observation period helps reduce the risk that eating, drinking, smoking, or regurgitation could affect the breath sample.
Can medical conditions affect breath-test results?
Certain medical conditions may become relevant when evaluating breath-test reliability and how a sample was obtained.
Disclaimer: The information provided in this blog is for general informational purposes only and is not intended as legal advice. Reading this blog or interacting with Ludwig Law Firm through this content does not create an attorney-client relationship. Every legal case is different, and you should not act or rely on any information in this blog without first consulting with a licensed attorney about your specific situation.