DUI Drugs

Yes. Oklahoma law does not distinguish between legal and illegal substances for DUI purposes. If any medication — whether prescribed, over-the-counter, or illegal — impairs your ability to drive safely, you can be charged with DUI. This includes common medications like muscle relaxers, benzodiazepines (Xanax, Valium), opioid pain medication, sleep aids (Ambien, Lunesta), and even some antihistamines.

No. Unlike alcohol's 0.08 BAC threshold, Oklahoma has no per se legal limit for marijuana or any other drug. Any detectable amount of a Schedule I controlled substance in your blood, saliva, or urine constitutes a DUI violation — regardless of whether you were actually impaired at the time of driving. This is significant because THC can remain detectable for up to 30 days after consumption.

No. A valid Oklahoma medical marijuana card provides absolutely no defense to a DUI-Drugs charge. If THC is detected in your system while driving — even from use days or weeks prior — you can be charged with DUI. An estimated 380,000+ Oklahoma medical marijuana cardholders technically risk DUI every time they drive.

Because breathalyzers do not detect drugs, the state relies on blood tests and Drug Recognition Expert (DRE) evaluations. Blood samples are sent to one of only four state-approved laboratories, with results typically taking 1-3 months. DRE officers use a 12-step evaluation protocol to assess impairment. Standard field sobriety tests are also administered, though studies have shown these tests are not validated for drug impairment the way they are for alcohol.

Yes — drug DUI cases are often more defensible than alcohol DUI cases. The fundamental weakness is that blood tests can only detect the presence of a substance, not active impairment at the time of driving. NHTSA itself has acknowledged there are no evidence-based methods to detect marijuana-impaired driving. DRE evaluations are not scientifically validated to the same degree as alcohol testing. Blood draw procedures must follow strict chain-of-custody requirements, and any procedural violation can result in evidence suppression.

Exercise your right to remain silent and contact a defense attorney immediately. Do not volunteer information about medications or substances you have used. You have the right to have your blood sample tested at an independent laboratory accredited by ASFCLD or ABFT. Note the 30-day deadline to challenge your license revocation or enroll in IDAP to maintain driving privileges with an interlock device.

There is no drug equivalent of DWI — DWI is exclusively an alcohol offense. However, some Oklahoma counties have been willing to reduce DUI-Drugs charges to DWI at the plea stage for medical marijuana cardholders who showed no other signs of impairment beyond THC blood test results. This is not guaranteed and depends on the jurisdiction, prosecutor, and specific facts of the case.

A DRE is a law enforcement officer who has completed specialized training in detecting drug impairment. DREs use a 12-step evaluation protocol including pupil examination, divided attention tests, vital sign measurements, and behavioral observations to form an opinion about whether a suspect is impaired and by what category of drug. However, DRE evaluations are not scientifically validated to the same degree as alcohol breathalyzer testing, and their conclusions can be effectively challenged by an experienced defense attorney.