Washington law draws a hard line at 0.08% BAC. Cross that line while driving, and you’ve committed a crime—regardless of whether you felt impaired or drove perfectly. This is called a “per se” DUI. The number alone is enough for conviction. Prosecutors don’t have to prove you were actually impaired. They just have to prove the number.
But that number isn’t as solid as it looks. Breath testing machines have error rates. Operators make mistakes. Calibration lapses happen. Medical conditions skew results. The prosecution’s case depends entirely on that BAC reading—which means undermining the reading undermines their entire case.
Eastside DUI has challenged over .08 DUI charges in King County for 15 years. Our attorneys—Roberto Yranela, Matthew Skau, and Robin Tu—understand breath test science, machine limitations, and the technical defenses that create reasonable doubt about BAC evidence. A Bellevue, WA DUI lawyer from our team can examine how your BAC was obtained and whether it can withstand scrutiny.
Contact us for a free consultation.
Why Choose Eastside DUI For Over .08 DUI Defense In Bellevue, WA?
We Know Breath Test Science
Defending per se DUI cases requires understanding how breath testing actually works—and where it fails. Partition ratios. Mouth alcohol contamination. Temperature variations. Calibration protocols. Radio frequency interference. These aren’t obscure technicalities. They’re real factors that affect whether a breath test accurately reflects blood alcohol concentration. A Bellevue DUI over .08 attorney who understands this science can identify weaknesses that attorneys without technical knowledge overlook.
Roberto Yranela has built DUI defenses around breath test challenges since 2013. He knows what questions to ask about the machine, the operator, and the testing conditions. His undergraduate work at the University of Washington included psychology—useful for understanding how confirmation bias affects officer observations. His J.D. from Valparaiso University School of Law gave him the legal framework. Years of practice applying both created the experience that matters in your case.
Recognized for DUI Defense Results
Super Lawyers recognized Roberto Yranela as Top 40 Under 40 specifically for DUI defense. Avvo awarded him Client’s Choice recognition. The National Trial Lawyers named him to their Top 40 Under 40. When you need a DUI attorney in Bellevue who has successfully challenged BAC evidence in cases like yours, our credentials demonstrate that track record.
The Number Can Be Wrong
Here’s what prosecutors won’t tell you: breath test machines don’t measure blood alcohol directly. They measure breath alcohol and convert it using an assumed ratio—a ratio that varies significantly between individuals. The machine assumes you’re average. You might not be. That assumption creates potential error that we exploit in your defense.
What Our Clients Say
⭐⭐⭐⭐⭐ “Roberto is fantastic! He has done such a great job with communication and taking his time out to help defend traffic citations. I will be referring him to friends as needed! Thank you so much Roberto!” – Randi Wright
Types Of Over .08 DUI Cases We Handle In Bellevue
BAC cases vary based on how far over the limit you tested and what circumstances surrounded the test. Our DUI defense attorneys handle the full spectrum.
- Borderline BAC cases (.08-.10). When results hover near the legal limit, measurement uncertainty becomes your ally. Breath tests have accepted error margins of ±0.01% or more. A reading of 0.09% might actually reflect a true BAC below the legal threshold. A Bellevue DUI lawyer presents this uncertainty as reasonable doubt.
- Elevated BAC cases (.10-.14). Mid-range BAC results face the same technical challenges as borderline cases, though the margin for error argument narrows. Defense strategy often shifts toward procedural violations, calibration failures, or operator errors.
- High BAC cases (.15 and above). Washington imposes enhanced penalties at 0.15% BAC. Challenging breathalyzer results becomes doubly important—not just to fight the underlying charge, but to avoid the enhanced mandatory minimums that high BAC triggers.
- Rising BAC defense cases. Alcohol takes time to absorb. Your BAC at the time of testing may have been higher than your BAC while actually driving. If you consumed alcohol shortly before driving, the rising BAC defense argues you were legal when behind the wheel.
- Medical condition cases. Certain conditions—GERD, diabetes, low-carb diets—can produce mouth alcohol or acetone that breath machines misread as ethanol. These biological factors create false high readings in people who aren’t actually impaired.
- Breath test refusal with blood draw. When defendants refuse breath testing, police sometimes obtain blood warrants. Blood tests are generally more accurate than breath tests but still require proper collection, storage, and chain of custody. Knowing your rights after arrest helps you understand what evidence the prosecution may have.
Washington Legal Requirements For DUI Over .08
Washington’s per se DUI law makes it illegal to drive with a BAC at or above 0.08%. Understanding how this law works—and its limitations—is essential to mounting an effective defense.
Under RCW 46.61.502, a person is guilty of DUI if they drive with a BAC of 0.08% or higher within two hours of driving. The prosecution doesn’t need to prove impairment. The number is the crime. But the prosecution must prove the number was obtained through proper procedures and reliable equipment.
The Washington State Patrol maintains the breath testing program and establishes protocols for instrument calibration and operator certification. Breath test machines must be calibrated according to schedule. Operators must maintain current certification. Testing procedures must follow established protocols. Deviation from any requirement can undermine result reliability.
Enhanced penalties apply at 0.15% BAC under RCW 46.61.5055. First offenders face two days minimum jail instead of one. Repeat offenders face 15-30 additional days depending on offense level. A DUI lawyer in Bellevue evaluates whether challenging the BAC level—even if not the entire test—could reduce your exposure.
The Washington Department of Licensing imposes administrative license suspension based on BAC results. Testing at or above 0.08% triggers automatic suspension unless you request a hearing within 20 days and prevail. A Bellevue DUI attorney handles both the criminal case and the DOL proceeding, using consistent defense strategies across both forums.
Challenging Over .08 BAC Evidence In Bellevue
A Bellevue DUI over .08 lawyer attacks BAC evidence through multiple angles:
- Machine calibration records. Breath testing instruments require regular calibration to produce accurate results. We subpoena calibration logs to verify the machine was properly maintained. Gaps in calibration history, out-of-tolerance readings during checks, or delayed maintenance create doubt about result accuracy.
- Operator certification and procedure. The person administering your breath test must hold current certification and follow established protocols. Did they observe you for the required 15-minute period before testing? Did they ensure no mouth alcohol contamination? Procedural shortcuts compromise results. Knowing what to avoid saying during the stop protects you, but operator errors protect you too.
- Partition ratio variability. Breath machines assume a 2100:1 ratio between breath alcohol and blood alcohol. Research shows actual ratios vary between individuals from roughly 1300:1 to 3000:1. Someone with a lower partition ratio will produce a falsely high breath test reading. Our drunk driving defense team uses this scientific reality to challenge the assumption underlying your test result.
- Mouth alcohol and contamination. Recent use of mouthwash, breath spray, or certain medications can leave residual alcohol in your mouth that the machine reads as deep lung air. GERD and acid reflux can bring stomach contents—including alcohol—back into the mouth. These contamination sources produce artificially elevated readings.
- Rising blood alcohol. If you finished drinking shortly before driving, your BAC was still climbing. The test administered 30-60 minutes after your stop may show a higher BAC than existed when you were actually behind the wheel. Professional testimony about alcohol absorption rates supports this defense.
- Challenging the stop itself. Per se cases still require lawful traffic stops. If police lacked reasonable suspicion to pull you over, the breath test result—regardless of the number—may be suppressed. Working with a DUI defense attorney who examines every aspect of your case, not just the BAC, maximizes defense opportunities.
Contact Eastside DUI
An over .08 BAC reading feels like a guaranteed conviction. It isn’t. The science behind breath testing has real limitations. The procedures for administering tests have real requirements. When prosecution cases depend entirely on a number, challenging that number can dismantle the entire case. Our Bellevue DUI over .08 lawyers have spent 15 years doing exactly that.
We offer free consultations to examine your breath test results and identify potential challenges. DUI defense fees start at $3,500, and we’re straightforward about costs before you commit.
That number doesn’t have to define your future. Contact Eastside DUI today.
