Can You Challenge the Results of a DUI Breathalyzer or Blood Test in Georgia?
Answer:
Yes — challenging the admissibility or reliability of chemical test results is one of the most critical components of DUI defense in Georgia. The most common grounds for suppression include: an unlawful traffic stop or arrest lacking reasonable articulable suspicion or probable cause, which taints all evidence gathered afterward; failure to properly administer Georgia’s implied consent notice before requesting a chemical test; consent that was not given freely and voluntarily; and challenges to the reliability of the test itself — including breathalyzer calibration records, blood sample handling and chain of custody documentation, and GBI Crime Lab protocol compliance. A successful suppression motion can eliminate the test result from evidence entirely, fundamentally weakening the government’s case.
Yes — and challenging the admissibility or reliability of chemical test results is one of the most critical components of DUI defense in Georgia. A breath or blood test result is not self-authenticating evidence that walks into court and speaks for itself. Before the government can introduce those results against a defendant at trial, it must satisfy specific legal and constitutional requirements. Failure to meet any of them provides grounds to suppress the evidence — and without the test result, the government’s case is often significantly weaker or fails entirely.
Ground One: Unlawful Stop, Detention, or Arrest
The Fourth Amendment requires that a traffic stop be supported by reasonable articulable suspicion that a law violation occurred, and that an arrest be supported by probable cause. If the initial stop lacked legal justification, or if the detention extended beyond what was lawfully authorized, or if the arrest was made without sufficient probable cause, then everything that followed — including any chemical testing — may be constitutionally tainted and subject to suppression.
This is the exclusionary rule at work: evidence obtained as a direct result of a Fourth Amendment violation cannot be used against the defendant at trial. A successful suppression motion on this ground eliminates not just the test result but potentially every piece of evidence gathered after the unlawful stop or arrest.
Ground Two: Implied Consent Notice Violations
Georgia’s implied consent law requires that, before requesting a chemical test, the arresting officer read the driver a specific implied consent notice using the exact language prescribed by statute. The notice informs the driver of their right to refuse, the consequences of refusal, and their right to an independent test. The reading must occur in the proper sequence — after arrest but before the test request — and must be substantially complete and accurate.
If the officer failed to read the implied consent notice, read an incorrect version, read it at the wrong time, or did so in a manner that was confusing or materially incomplete, the resulting chemical test may be suppressed. Georgia courts have addressed numerous implied consent challenges, and defense counsel must be current on the evolving case law governing what constitutes a sufficient reading.
Ground Three: Absence of Free and Voluntary Consent
Georgia’s constitutional right against self-incrimination provides protection in the blood and breath testing context. If a driver’s consent to provide a chemical sample was not given freely and voluntarily — for example, if it was obtained through coercion, threats, or misrepresentation of the driver’s legal options — the resulting test may be suppressible on self-incrimination grounds under the Georgia Constitution. This ground is distinct from the Fourth Amendment analysis and provides an additional avenue of challenge.
Challenging the Test Itself: Calibration, Protocol, and Chain of Custody
Even where the test was lawfully obtained, the reliability of the result can be challenged. Breath testing instruments must be properly maintained and regularly calibrated according to established protocols, and records of that maintenance must be available. Blood samples must be collected using approved procedures, stored properly to prevent degradation or fermentation, and maintained through a documented chain of custody from collection to analysis. Deficiencies in any of these areas — equipment maintenance failures, improper collection techniques, gaps in chain of custody documentation, or errors in lab analysis — can form the basis of a challenge to the reliability of the test result at trial.
An experienced DUI defense attorney will obtain all available records related to the chemical test, analyze them for every potential vulnerability, and pursue every applicable suppression ground or reliability challenge to give the defendant the strongest possible defense.
