There is a bright line when it comes to alcohol DUI charges, and it is 0.08. In Georgia, you don’t have a line for marijuana DUI. The Georgia law doesn’t have a per se THC limit, which is surprising to many drivers — particularly those who think they are covered by a legal product, medical card or a low-THC oil registration. It does not. Here’s how real THC DUI cases are constructed and contested.
No number decides the case
For alcohol, Georgia law says a blood-alcohol level of 0.08 or higher is DUI by itself. For marijuana, there is no equivalent number. Rather, the prosecutor has to show that the driver was impaired by marijuana to the degree that he or she was less safe to operate a motor vehicle. That is a judgment call built from evidence: driving behavior, the officer’s observations, field sobriety performance, admissions, and chemical test results. Without a legal limit, the dynamic cuts both ways: the state cannot point to a number — but it does not need one either.
How officers build a THC DUI case
The traffic stop is the beginning of most marijuana DUI investigations. Officers look for the familiar cues — odor of marijuana, bloodshot eyes, delayed reactions — and then administer field sobriety tests. If the officer believes the driver is impaired, the next step is usually a blood test rather than a breath test, since breath devices do not measure THC. Drivers should know that Georgia’s implied consent law applies to drug DUIs too: refusing the state-administered blood test after arrest can trigger a license suspension through the administrative process, separate from the criminal case.
Why blood tests are weaker than they look
A blood test showing THC proves exposure, not impairment. THC metabolites can remain detectable for days or weeks after use, well after any impairing effect has faded. The state still needs evidence connecting the THC to actual impairment at the time of driving — erratic driving, failed sobriety tests, the officer’s detailed observations. The timing of the blood draw matters as well: delays between the stop and the draw can distort what the result actually shows about the driver’s condition behind the wheel. Cases built mostly on a weeks-old metabolite result, with thin driving evidence, are vulnerable.
Medical marijuana and Georgia’s low-THC oil registry
Georgia’s medical program is narrow: registered patients may possess low-THC oil, but Georgia has not legalized recreational marijuana, and the registry is not a defense to DUI. A valid registration does not permit driving while impaired, and officers make no distinction between medical and recreational use at the roadside. Out-of-state medical cards carry no special protection in Georgia either. The legal status of the product and the question of impairment are two entirely separate issues.
Defenses that matter in THC cases
THC DUI cases are often more defensible than alcohol cases precisely because there is no number to hide behind. Common challenges include the legality of the traffic stop itself, the reliability of field sobriety tests administered by officers with limited drug-recognition training, gaps between the driving and the blood draw, and the state’s failure to connect test results to actual impairment. An officer’s subjective observations carry less weight when the driving pattern was unremarkable and the video tells a different story than the report.
If you are facing a marijuana-related DUI, do not assume the blood test result decides everything. These cases turn on the details — the reason for the stop, the quality of the observations, and whether the state can actually prove you were less safe to drive. An Atlanta DUI Lawyer experienced with drug DUI cases can evaluate the evidence the way prosecutors will. A knowledgeable Atlanta DUI Attorney knows how to challenge blood evidence and shaky officer conclusions. Look for a DUI Attorney Atlanta courts respect in contested hearings, and choose a DUI Lawyer Atlanta drivers trust when the case is anything but open and shut.
