Beating the Draeger Alcotest 7110: Common Breathalyzer False Positives in Alabama Courts

When Alabama law enforcement arrests an individual for suspected driving under the influence under Ala. Code § 32-5A-191, chemical testing at the station has historically relied on the Draeger Alcotest 7110 MK III-C. However, with the manufacturer retiring the Alcotest 7110, the Alabama Department of Forensic Sciences, Auburn has transitioned testing statewide to the Intoximeters Intox DMT Dual Sensor under Ala. Admin. Code r. 370-1-1-.01. Many drivers assume that an adverse breathalyzer result guarantees a conviction. Yet whether tested on an Intox DMT Dual Sensor or a legacy Draeger device, these instruments remain vulnerable to mechanical errors, physiological anomalies, and operator mistakes. Whether facing prosecution in Huntsville, Montgomery, Birmingham, or Mobile, understanding the scientific flaws of evidentiary breath testing is critical. Connecting with a knowledgeable defense lawyer through our US Lawyers directory can help expose breathalyzer false positives before the court.

Understanding Breathalyzer False Positives

Both the legacy Draeger Alcotest 7110 and the newer Intoximeters Intox DMT Dual Sensor utilize infrared spectroscopy and electrochemical fuel cell sensors to measure breath alcohol concentration from deep lung air (alveolar air). Under Ala. Admin. Code r. 370-1-1-.01, instruments must meet strict analytical criteria before the state can generate an evidentiary Certificate of Analysis. However, evidentiary breath machines cannot always perfectly distinguish ethyl alcohol (beverage alcohol) from interfering volatile compounds produced by the human body or trapped in the oral cavity. This vulnerability frequently produces artificially elevated BAC readings presented in Alabama District Courts and Municipal Courts.

GERD and Acid Reflux Scenarios

Gastroesophageal Reflux Disease (GERD), heartburn, and acid reflux are common medical conditions that can completely invalidate a breathalyzer test. If you have alcohol in your stomach, acid reflux can force raw, unabsorbed alcohol vapors back up into your esophagus and mouth just before you blow into the tube. Evidentiary breath instruments can mistake this concentrated "mouth alcohol" for the deep lung alveolar air they are calibrated to measure, producing an artificially inflated BAC reading even after consuming only a negligible amount of alcohol.

Keto Diets and Diabetic Ketoacidosis

Strict adherence to a ketogenic (Keto) diet forces the liver to burn fat instead of carbohydrates, producing ketone bodies. The primary volatile ketone body excreted through alveolar breath is acetone. Similarly, individuals suffering from uncontrolled diabetes can experience diabetic ketoacidosis (DKA), which produces high levels of endogenous acetone (and, in severe metabolic cases, secondary trace amounts of isopropanol). While modern dual-sensor instruments attempt to filter out interfering substances, elevated breath acetone can still cause spectral cross-reactivity or fuel-cell interference, falsely elevating reported BAC. A defense attorney can utilize medical records and metabolic testing to demonstrate that dietary ketosis or ketoacidosis corrupted the breath sample.

Recent Dental Work and Trapped Alcohol

If you have braces, dentures, bridgework, periodontal pockets, or recent oral surgery, trace alcohol can become trapped in the oral cavity. When you blow into the testing instrument, this trapped alcohol vaporizes directly into the collection chamber. Because the device mathematical algorithm assumes all detected alcohol originates from deep lung air and multiplies it accordingly, tiny amounts of trapped mouth alcohol can produce an unlawfully high, inaccurate BAC reading.

The Impact of Mouthwash and Breath Sprays

Many commercial mouthwashes, breath sprays, and over-the-counter cold medicines contain high concentrations of alcohol-sometimes exceeding 20%. Using these products shortly before being stopped will contaminate the oral cavity with pure alcohol. Under Ala. Admin. Code r. 370-1-1-.01, law enforcement officers must maintain a strict 20-minute pre-test deprivation period to ensure the subject does not ingest, regurgitate, or smoke anything that could contaminate the breath sample. Failure to strictly enforce this observation window constitutes prime grounds to challenge the admissibility of the chemical test.

Challenging Calibration and Operator Certification

Even if an individual has no underlying medical conditions, evidentiary breath testing instruments must be rigorously inspected and maintained. In Alabama, breath instruments are governed by quality control protocols overseen by the Alabama Department of Forensic Sciences, Auburn. Under Ala. Admin. Code r. 370-1-1, App. A, instruments must undergo scheduled electronic inspections and annual laboratory evaluations. Furthermore, under Alabama law, the officer administering the breath test must hold an active permit from ADFS for the specific testing instrument (such as the Intoximeters Intox DMT Dual Sensor or Draeger Alcotest 7110).

As established in Alabama case law, such as Stubstad v. City of Orange Beach, 575 So. 2d 1240 (AL Court of Criminal Appeals 1991), the prosecution must establish a proper predicate for the admission of breath test results, including proving strict compliance with ADFS regulations. Your defense lawyer can subpoena dry-gas standard verification records, maintenance logs, and operator certification files. If the instrument missed mandatory quality checks or the operator's permit had lapsed, your attorney can move to suppress the chemical test results, often dismantling the prosecution's per se DUI case.

How Long Does the Process Take?

Challenging breathalyzer evidence requires time and meticulous preparation. Generally, obtaining the maintenance logs and calibration records through the discovery process takes 4 to 8 weeks. If your lawyer files a motion to suppress the chemical test results, the court will schedule a special evidentiary hearing before the actual trial. This can extend your overall court timeline to 6 to 12 months, but it is often worth the wait to successfully exclude flawed evidence.

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