Breath Tests Explained: Common Causes of False Readings

Written by Jerry Steele

DUI

Breath Tests Explained: Common Causes of False Readings

Written by Jerry Steele

DUI
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For more than 20 years, Steele Law has successfully guided individuals and business entities through the unique challenges posed by criminal and regulatory investigations, as well as prosecutions in state and federal courts nationwide.
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Law enforcement commonly uses breath tests to assess a driver’s blood alcohol concentration. These devices are thought of as dependable, but they are not perfect. False readings can arise for various reasons, resulting in unjust DUI charges. 

Common Causes of False Breathalyzer Readings

Understanding what causes a breath test to yield incorrect results is critical for anyone facing DUI charges.

Residual Mouth Alcohol

One of the most common causes of inaccurate readings is alcohol residue in the mouth. This can occur if a person burps, vomits, or regurgitates shortly before taking the exam. 

The breathalyzer detects alcohol in deep lung air (alveolar air); however, alcohol from the stomach and the mouth can skew the results.

Certain foods, mouthwashes, and breath sprays may also leave alcohol residue in the mouth. While the alcohol in these goods is insufficient to cause intoxication, it can be detected by a breathalyzer, resulting in an elevated BAC level.

Medical Conditions

Certain medical disorders can affect the accuracy of a breath test. People suffering from gastroesophageal reflux disease (GERD) or acid reflux may result in the upward migration of stomach contents, including alcohol, into their mouth. 

People with diabetes may experience special obstacles when doing breath tests. When blood sugar levels drop, the body creates ketones, which can be detected in the breath as acetone. 

Some breathalyzers cannot distinguish between acetone and ethanol, the type of alcohol contained in alcoholic beverages, resulting in false positive results.

Breathing Patterns

The way a person breathes before taking the test can influence the outcome.

Hyperventilating, holding one’s breath, or taking shallow breaths can all affect the concentration of alcohol in the breath. 

Environmental Factors

Environmental factors such as air temperature, humidity, and the presence of particular chemicals can all influence breath test results. 

Breathalyzers rely on certain chemical reactions, and exposure to certain fumes or solvents might impair their accuracy. 

Improper Calibration And Maintenance

Breathalyzer devices require regular maintenance and calibration to ensure accuracy. 

Sensors can lose sensitivity over time, and if the equipment is not calibrated properly, it may produce erroneous data. 

User Error

If the officer does not wait the required observation period before giving the test, or if the instructions for blowing into the device are unclear, the results may be invalid. 

Conclusion: Speak with a DUI Defence Lawyer

A qualified lawyer might contest the accuracy of the reading, query the device’s upkeep, and investigate the testing process for any procedural irregularities that may have happened.

Contact Jerry Steele of Steele Law today to talk about fighting your charges.