Washington legalized recreational marijuana in 2012. What the state didn’t legalize was driving after consumption. And unlike alcohol—where decades of research connect specific BAC levels to predictable impairment—the science linking THC blood concentration to actual driving impairment remains deeply contested. Yet Washington law draws an arbitrary line at 5 nanograms per milliliter, treating everyone above that threshold as per se impaired regardless of tolerance, timing, or actual driving behavior.
The result is a legal framework that punishes regular cannabis users for blood chemistry that may have nothing to do with their ability to drive safely. THC metabolites linger in the bloodstream for days or weeks after any impairing effects have disappeared. A medical marijuana patient who consumed cannabis yesterday—or last week—can test above 5 ng/mL while completely sober.
Eastside DUI has defended marijuana DUI cases throughout King County for 15 years. Our attorneys—Roberto Yranela, Matthew Skau, and Robin Tu—understand the scientific weaknesses in THC impairment evidence and how to expose those weaknesses in court. A Bellevue, WA DUI lawyer from our firm can challenge the assumptions underlying your marijuana DUI charge and fight for the outcome you deserve.
Contact us for a free consultation.
Why Choose Eastside DUI For Marijuana DUI Defense In Bellevue, WA?
We Understand the Science Prosecutors Don’t Want Juries to Hear
The 5 ng/mL THC threshold has no solid scientific foundation. Unlike the 0.08% BAC standard for alcohol—developed through extensive research correlating blood alcohol to impairment—the THC threshold was essentially a political compromise. Studies have failed to establish reliable correlation between THC blood levels and driving impairment. Frequent cannabis users may function normally at levels that would incapacitate occasional users. The timing between consumption and testing dramatically affects results in ways that don’t track actual impairment.
A Bellevue marijuana DUI attorney who understands this contested science can present defenses unavailable to lawyers who treat THC cases like alcohol DUI with a different chemical.
Roberto Yranela has followed the evolving science of cannabis and driving since Washington legalized recreational use. He understands how THC metabolizes differently than alcohol, why blood tests capture historical consumption rather than current impairment, and how to present these realities to judges and juries. His undergraduate degrees from the University of Washington and J.D. from Valparaiso University School of Law provided the foundation for analyzing complex scientific evidence and translating it into effective courtroom arguments.
Recognized DUI Defense Credentials
Super Lawyers named Roberto Yranela to the Top 40 Under 40 for DUI defense. Avvo honored him with Client’s Choice recognition. The National Trial Lawyers included him in their Top 40 Under 40. When you need a DUI attorney in Bellevue capable of challenging marijuana impairment evidence with scientific rigor, our credentials demonstrate that capability.
Legal Use Doesn’t Mean Easy Prosecution
Prosecutors assume marijuana DUI cases are straightforward—blood test above 5 ng/mL equals conviction. We know better. The gap between what THC blood levels prove and what the prosecution must establish creates substantial room for effective defense.
What Our Clients Say
⭐⭐⭐⭐⭐ “I used Roberto for a speeding ticket out of King County District Court in Issaquah. He was very easy to work with. Great communication. And he was able to get my ticket dismissed. I will definitely use him again for any other traffic matters and recommend him to any one I know.” – Ashton Amirkabirian
Types Of Marijuana DUI Cases We Handle In Bellevue
Cannabis-related driving charges arise in various contexts, each presenting distinct defense opportunities. Our DUI defense attorneys handle the full spectrum.
- Recreational marijuana DUI. Washington permits adult recreational cannabis use, but driving afterward remains illegal. A Bellevue DUI lawyer challenges whether the THC level detected actually reflects impairment at the time of driving—or residual presence from consumption hours or days earlier.
- Medical marijuana DUI. Patients with valid medical marijuana authorizations face the same DUI laws as recreational users. Chronic therapeutic use often produces baseline THC levels above 5 ng/mL even when the patient experiences no impairing effects. Medical documentation supports defenses based on tolerance and timing.
- THC blood test challenges. Blood testing for THC involves different protocols than alcohol testing. Collection timing, storage conditions, and laboratory procedures all affect results. Challenging breathalyzer results involves different techniques than challenging blood evidence, but vulnerabilities exist in both testing methodologies.
- Drug Recognition Expert cases. When officers suspect drug impairment, they may call Drug Recognition Experts—officers with specialized training in identifying substance impairment. DRE protocols have significant limitations and subjective elements that skilled cross-examination can expose.
- Combined substance cases. Some marijuana DUI cases involve allegations of cannabis combined with alcohol or other substances. These cases require analysis of how different substances interact and whether the combined effect actually caused impairment.
- Marijuana DUI with accident. When collisions occur, prosecutors argue that cannabis caused the accident. Knowing your rights after arrest helps you understand what evidence the prosecution may try to use—but causation remains a separate element they must prove.
Washington Legal Requirements For Marijuana DUI
Washington law treats marijuana DUI similarly to alcohol DUI, but the scientific foundations differ dramatically. Understanding the legal framework reveals where defense challenges apply.
Under RCW 46.61.502, driving with THC concentration of 5.00 ng/mL or higher constitutes a per se DUI violation—just as driving at 0.08% BAC does. The prosecution doesn’t need to prove actual impairment if they establish the blood level exceeded the threshold within two hours of driving.
However, the statute also permits prosecution based on impairment without reference to a specific THC level. Officers can arrest for marijuana DUI based on observations of impaired driving, physical indicators, and field evaluations—even if blood testing shows THC below 5 ng/mL. A DUI lawyer in Bellevue defends against both per se and impairment-based marijuana DUI theories.
The Washington State Patrol trains Drug Recognition Experts who conduct standardized evaluations when officers suspect drug impairment. The DRE protocol involves a twelve-step process including vital signs measurement, eye examinations, divided attention tests, and physical observations. These evaluations are more complex than standard field sobriety testing—but also more vulnerable to challenge due to their subjective components.
Penalties for marijuana DUI mirror alcohol DUI penalties under RCW 46.61.5055. First offense carries mandatory minimum jail time, fines, license suspension, and ignition interlock requirements. The Washington Department of Licensing imposes administrative consequences that operate independently from the criminal case. A Bellevue DUI attorney addresses both the criminal prosecution and the DOL administrative proceeding.
Defense Strategies For Marijuana DUI In Bellevue
A Bellevue marijuana DUI lawyer employs strategies targeting the unique weaknesses of cannabis impairment evidence:
- Challenging the THC-impairment correlation. Unlike alcohol, no scientific consensus establishes that 5 ng/mL THC correlates with impairment. Peer-reviewed studies show enormous individual variation. Regular users develop tolerance that allows normal function at levels that would impair occasional users. We present expert testimony and scientific literature demonstrating that the blood level detected in your case doesn’t prove impairment. Our drunk driving defense team applies rigorous scientific analysis to marijuana cases just as we do to alcohol cases.
- Attacking the timing disconnect. THC blood levels change rapidly after consumption, typically peaking within minutes and declining quickly—while impairment follows a different timeline. The blood draw taken an hour after your stop may show levels very different from your actual THC concentration while driving. This timing gap creates reasonable doubt about whether you exceeded 5 ng/mL when actually behind the wheel.
- Exposing residual THC issues. Chronic cannabis users maintain detectable THC levels for days or weeks after their last use. Someone who consumed marijuana three days ago may still test above 5 ng/mL without any current impairment whatsoever. Your medical history and usage patterns can establish that the detected THC reflects residual presence rather than recent consumption.
- Challenging blood collection and testing. Blood draws require proper procedures—qualified personnel, appropriate collection tubes, correct storage, timely analysis. Deviations compromise results. We examine every step in the chain from your arm to the laboratory report.
- Attacking DRE evaluations. Drug Recognition Expert protocols involve substantial subjectivity. The twelve-step evaluation relies heavily on officer interpretation. Training varies. Experience differs. Confirmation bias affects observations. Knowing what to avoid saying during your stop protects you from statements used against you, but the DRE’s documented observations also deserve aggressive challenge.
- Presenting alternative explanations. Physical signs officers attribute to marijuana impairment often have innocent explanations. Red eyes result from allergies, fatigue, or contact lenses. Nervousness causes tremors and elevated pulse. Medical conditions affect balance and coordination. We construct narratives that explain officer observations without requiring cannabis impairment.
- Challenging the traffic stop. Every marijuana DUI case starts with a stop. Officers needed reasonable suspicion to pull you over. If the driving behavior they observed doesn’t actually suggest impairment—or if the stop lacked legal justification entirely—the evidence obtained afterward may be suppressed. Working with a DUI defense attorney who examines every element of your case, from the initial stop through blood testing, maximizes the defense opportunities available.
Contact Eastside DUI
Marijuana DUI charges rest on science that doesn’t support the conclusions prosecutors draw. The 5 ng/mL threshold lacks the research foundation underlying alcohol DUI standards. The THC detected in your blood may reflect consumption from days ago rather than impairment while driving. Our Bellevue marijuana DUI lawyers have spent 15 years exposing these weaknesses—challenging blood test evidence, attacking DRE evaluations, and presenting the scientific reality that THC blood levels don’t prove what prosecutors claim.
We offer free consultations to evaluate your marijuana DUI case and identify the strongest defense strategies. DUI defense fees start at $3,500, and we explain costs clearly before you commit.
Legal cannabis doesn’t mean automatic conviction. Contact Eastside DUI today.
