Driving While Smoking Pot is a misdemeanor or felony DUI and could cost you big. If you enjoy Oklahoma’s booming medical marijuana program, you might assume that holding a valid state license or prescription protects you from a DUI.
The short answer is an absolute, resounding YES.
Not only can you get a DUI for driving while smoking marijuana, but Oklahoma also has some of the strictest, most unforgiving drugged driving laws in the nation. In fact, under state law, you don’t even have to be actively “high” or driving erratically to find yourself handcuffed in the back of a police cruiser.
Here is what every Oklahoma driver needs to know about cannabis and DUI laws.
Reality of Oklahoma’s “Per Se” Cannabis Law
When it comes to alcohol, everyone knows the legal limit is a blood alcohol concentration (BAC) of 0.08%. If you are under that, prosecutors have to work harder to prove you were impaired. Marijuana is treated entirely differently. Oklahoma enforces a strict “per se” standard for controlled substances (47 O.S. § 11-902).
The Law: It is illegal to operate a motor vehicle with any detectable amount of a Schedule I chemical, controlled substance, or its metabolites in your blood, saliva, or urine.
Because cannabis is still classified as a Schedule I substance under Oklahoma law, the legal limit for THC is essentially zero.
The Toxic Trap: Active THC vs. Inactive Metabolites
This creates a massive legal trap for regular users. THC is fat-soluble and leaves behind inactive metabolites that can stay in your system for weeks after the psychoactive “high” has worn off.
If you smoked a joint on Friday night and get pulled over on Tuesday afternoon, you are completely sober. However, if an officer orders a blood test, those leftover metabolites will show up. Under Oklahoma’s strict interpretation, that positive test alone is enough for a prosecutor to charge you with a DUI.
Oklahoma’s New Laws on Smoking in Cars
The laws surrounding vehicles and cannabis are tightening. A recent state law explicitly target drivers and passengers who consume cannabis inside a vehicle.
- No Smoking or Inhaling: It is a crime to consume marijuana or even inhale secondhand marijuana smoke while operating a motor vehicle on a public road.
- Passengers Count Too: If your passenger fires up a pipe or a joint while you are driving, you can still face criminal charges.
- Open Container Violations: Just like an open can of beer, having an open container of marijuana in the passenger area of a vehicle is strictly prohibited.
If an officer pulls you over and smells active marijuana smoke, you are likely looking at multiple charges: the baseline vehicle consumption misdemeanor and a standard DUI-Drugs (DUI-D) charge.
But I Have a Valid Medical Marijuana Card!”
Driving While Smoking Pot is a DUI even if you have a marijuana card. This is the most common misconception defense attorneys hear. A medical marijuana card is not a shield against a DUI.
Oklahoma statute explicitly states that being legally entitled to use a substance—whether it is a prescription opioid or medical cannabis—is not an affirmative defense against a DUI charge. The state views it exactly like alcohol: it is legal to buy and consume, but it is never legal to use it and get behind the wheel.
What Happens If You Are Convicted?
The penalties for a Marijuana DUI in Oklahoma are severe and can completely disrupt your life.
| Offense | Classification | Potential Penalties |
| First Offense | Misdemeanor | Up to 1 year in county jail, a fine of up to $1,000, and mandatory drug assessment/treatment. |
| Second Offense (Within 10 years) | Felony | 1 to 5 years in state prison, a fine of up to $2,500, and driver’s license suspension. |
| Subsequent Offenses | Felony | Up to 20 years in prison, massive fines, and a permanent felony record. |
Note: If you have a minor child in the car when pulled over, you can also be hit with felony Child Endangerment charges, which instantly doubles the fines.
How to Protect Your Rights During a Traffic Stop
If you are pulled over and an officer suspects you have been smoking pot, they will look for red eyes, slow speech, and the smell of marijuana. To protect your future, keep these rules in mind:
- Be Polite, but Silent: You must provide your license, registration, and insurance. However, you do not have to answer questions like, “When was the last time you smoked?” Simply state: “I am choosing to remain silent until I speak with my lawyer.”
- Refuse Field Sobriety Tests: Roadside tests (like standing on one leg or walking a straight line) are highly subjective. In Oklahoma, these tests are completely voluntary. You have the right to politely decline them.
- Understand Implied Consent: If you are formally arrested, the officer will ask for a blood, saliva, or urine test. Under Oklahoma’s implied consent laws, refusing this chemical test results in an automatic driver’s license suspension.
Fight Back with an Experienced Oklahoma DUI Defense Attorney
Driving While Smoking Pot in Oklahoma can land you in trouble with the law. A marijuana DUI charge feels incredibly unfair—especially if you weren’t actually impaired when you were driving. The good news is that these cases are rarely open-and-shut. An experienced criminal defense attorney at Tulsa Criminal Lawyers Law Firm can challenge the legality of the initial traffic stop, fight the subjective observations of the officer, and scrutinize the laboratory testing protocols used on your blood sample to build an aggressive defense.
Don’t wait to protect your freedom. In Oklahoma, you have a strict, limited window of time (just 30 days from your arrest) to appeal your driver’s license suspension. Contact our office today for a free consultation. For a free consultation with a Tulsa DUI attorney from Tulsa Criminal Lawyers Law Firm, call 918-416-0358. You can also get an online consultation using this link.