In Georgia, driving under the influence (DUI) is not limited to alcohol. A person can be charged with DUI for operating a motor vehicle while impaired by any drug — whether prescription, over-the-counter, or illicit. DUI-drugs charges operate under a fundamentally different legal framework than DUI-alcohol cases, and understanding those differences is critical for any driver charged under this statute.

Georgia’s DUI Statute: Two Standards for Drug Impairment

The primary DUI statute is O.C.G.A. § 40-6-391. For alcohol, the statute establishes a per se legal limit of 0.08 grams of alcohol per 100 milliliters of blood (or equivalent breath or urine concentration). A driver at or above this limit is per se guilty of DUI under O.C.G.A. § 40-6-391(a)(5), regardless of whether any observable impairment is present. This per se standard provides a bright-line rule that both prosecutors and jurors can easily apply.

DUI drugs is fundamentally different. There is no per se legal limit for any controlled substance under Georgia law — not for cannabis, not for cocaine, not for methamphetamine, and not for prescription medications. The absence of a numerical threshold has two major implications: first, the government is authorized to charge a driver with DUI drugs upon finding any detectable amount of a controlled substance in the driver’s blood or urine; second, the government must still prove that the drug actually caused impairment of the driver’s ability to drive safely.

The ‘Less Safe’ Standard

The primary basis for a DUI-drugs prosecution in Georgia is what practitioners call the ‘less safe’ standard, codified at O.C.G.A. § 40-6-391(a)(2). Under this provision, it is unlawful to drive or be in actual physical control of a moving vehicle while under the influence of any drug to the extent that it is less safe for the person to drive. The government must prove not only that the driver had a drug in their system, but that the drug rendered the driver less safe to operate a motor vehicle.

This is a higher evidentiary burden than the per se alcohol standard — in theory. In practice, however, prosecutors frequently introduce a positive toxicology result for a controlled substance and argue that the mere presence of the drug, combined with observed driving behavior or field sobriety test performance, is sufficient to establish impairment. Defense counsel must aggressively challenge this inference, because the presence of a drug in the bloodstream does not, by itself, establish that the driver was impaired at the time of driving.

The Per Se Drug Standard Under O.C.G.A. § 40-6-391(a)(6)

In addition to the less safe standard, Georgia also has a per se drug DUI provision under O.C.G.A. § 40-6-391(a)(6). This section makes it unlawful to drive with any amount of marijuana or a controlled substance, as defined in O.C.G.A. § 16-13-21, present in the blood or urine. This provision effectively creates a zero-tolerance rule for controlled substances — if any metabolite of a Schedule I or Schedule II controlled substance is detected in the driver’s blood or urine, the driver can be charged under this subsection regardless of whether any impairment was present.

The per se drug provision has been the subject of significant legal challenge, particularly in cannabis cases. Georgia courts have grappled with the fact that THC metabolites — particularly the inactive carboxy-THC metabolite — can persist in urine for days or weeks after the last cannabis use, long after any impairing effects have dissipated. A driver who legally used cannabis (in a state where it is legal) days before entering Georgia, or a medical cannabis patient, could theoretically test positive under this provision despite being perfectly safe to drive.

Commonly Involved Substances in Georgia DUI-Drugs Cases

Georgia DUI-drugs prosecutions involve a wide range of substances. Cannabis remains the most commonly detected substance in DUI-drugs cases statewide, followed by prescription medications — particularly benzodiazepines (such as Xanax and Valium), opioids (such as hydrocodone and oxycodone), and muscle relaxants (such as carisoprodol). Stimulants including methamphetamine and cocaine also appear with regularity. Importantly, lawfully prescribed medications are not exempt from the DUI statute. A driver who takes a prescription sleep aid or anti-anxiety medication and drives while impaired by that medication can be convicted of DUI drugs in Georgia.

Testing Methods in DUI-Drugs Cases

Unlike DUI-alcohol cases, where a breath test can provide a near-immediate BAC reading, DUI-drugs cases almost always require a blood draw for chemical analysis. Urine testing is less commonly used because urine reflects only historical drug exposure rather than current blood concentration. Blood samples in DUI-drugs cases are typically analyzed by the Georgia Bureau of Investigation (GBI) Crime Laboratory using gas chromatography-mass spectrometry (GC-MS), which can identify and quantify specific drugs and metabolites to a high degree of precision.

Under O.C.G.A. § 40-6-392, the implied consent law requires the driver to submit to a chemical test at the officer’s request. If the driver refuses, the refusal is admissible at trial as consciousness of guilt evidence, and the officer may seek a search warrant for a blood draw. Law enforcement in Georgia increasingly obtains blood draw warrants in DUI-drugs cases where consent is refused, particularly when a Drug Recognition Expert is involved.

Defense Strategies in DUI-Drugs Cases

The absence of a per se limit creates a genuine and meaningful defense opportunity in Georgia DUI-drugs cases. Because the government must prove impairment — not merely detection — defense counsel can attack the causal link between the detected substance and the driver’s condition at the time of driving. Key defense strategies include:

• Challenging the scientific validity of using blood or urine concentration as a proxy for impairment, particularly in cannabis cases where the relationship between blood THC levels and functional impairment is not scientifically established
• Presenting independent toxicology expert testimony explaining the pharmacokinetics of the substance at issue — including how quickly it is metabolized and at what point its impairing effects diminish
• Challenging the qualifications, methodology, and conclusions of any Drug Recognition Expert involved in the case
• Attacking the field sobriety test results for improper administration, environmental factors, or medical conditions affecting the driver’s performance
• Challenging the legality of the traffic stop, the arrest, and the chemical testing process for constitutional violations under the Fourth and Fifth Amendments
• In cases involving prescription medications, establishing that the driver was taking the medication as prescribed and that its effects at prescribed doses did not render the driver less safe

DUI-drugs charges in Georgia carry the same penalties as DUI-alcohol, including mandatory minimum jail time, fines, license suspension, and the requirement to complete a DUI risk reduction program. For a first offense, penalties under O.C.G.A. § 40-6-391(c) include 24 hours to 12 months in jail (with a mandatory minimum of 24 hours served), fines of $300 to $1,000, 40 hours of community service, a 12-month license suspension, and completion of a DUI Alcohol or Drug Use Risk Reduction Program. Given these consequences and the complexity of DUI-drugs cases, early consultation with an experienced criminal defense attorney is essential.