When facing a driving under the influence (DUI) charge in California, the odds can often feel stacked against you. The stakes escalate significantly when an arrest involves a high Blood Alcohol Concentration (BAC), a prior DUI conviction within 10 years, and allegations of child endangerment.
However, top-tier Torrance DUI defense attorney Matthew Ruff has proven time and again that even the most complex, evidence-heavy cases can be successfully dismantled when you know how to scrutinize police procedures and leverage constitutional rights.
In a recent case stemming from an arrest in Laguna Beach, Mr. Ruff secured an Official Order of Set Aside from the California Department of Motor Vehicles (DMV) Driver Safety Office, completely reversing an administrative driver’s license suspension for a client who was facing a 0.20% BAC blood test result and a 2-year license revocation.
Here is how Attorney Matthew Ruff uncovered a critical mistake of law to win this case.
The Arrest: High BAC, Prior Record, and Severe Charges
The incident occurred when an officer with the Laguna Beach Police Department conducted a late-night traffic stop. According to police reports:
- The Justification for the Stop: The officer alleged that the driver was traveling the wrong way on 100 Cliff Drive in Laguna Beach, citing a violation of California Vehicle Code (CVC) § 21651(b)—the statute governing wrong-way driving on a divided highway.
- The Investigation: During the stop, the officer reported observing signs of intoxication, including watery eyes, droopy eyelids, and a strong odor of alcohol. The driver was subjected to Field Sobriety Tests (FSTs) and taken into custody.
- High-BAC Blood Test: A subsequent blood draw conducted at the jail revealed a 0.20% BAC—more than double the legal limit.
- Compounding Factors: The client’s record reflected a prior DUI arrest from Ventura County. Additionally, because a 15-year-old minor was inside the vehicle at the time of the stop, law enforcement recommended severe felony child endangerment charges (PC § 273a(a)) alongside misdemeanor DUI (CVC § 23152(a)).
Given the chemical test results and the driver’s legal history, the DMV moved to issue an administrative suspension/revocation order under CVC § 13353.2.
The Legal Strategy: Dismantling the Reasonable Suspicion
Under California law, the DMV bears the burden of proving by a preponderance of evidence that the arresting officer had reasonable cause to believe the individual was driving under the influence. Crucially, a legal stop under the Fourth Amendment is a mandatory prerequisite. If the initial traffic stop is unlawful, all evidence derived from that stop becomes inadmissible.
Instead of focusing solely on challenging the 0.20% blood alcohol science, Attorney Matthew Ruff targeted the foundation of the State’s entire case: the legality of the initial traffic stop.
1. Exposing a Mistake of Law via CVC § 21651(b)
The Laguna Beach Police Department report cited a violation of CVC § 21651(b) as the sole reason for pulling the vehicle over.
- Under CVC § 21651(a), a road is legally defined as a “divided highway” only if it is separated into two or more distinct roadways by physical barriers, curbs, raised dividing sections, or double parallel lines of not less than two feet in width.
- CVC § 21651(b) specifically prohibits driving a vehicle to the left of such a dividing section.
Mr. Ruff submitted a detailed Memorandum of Points and Authorities asserting that the officer made a fundamental mistake of law. Utilizing official map data and satellite imagery, Attorney Ruff proved that the 100 block of Cliff Drive in Laguna Beach is an undivided, municipal residential street—not a divided highway under CVC § 21651.
Because an officer’s mistake of law cannot create valid reasonable suspicion for a traffic stop, the law enforcement officer had no objective legal basis to initiate the stop under CVC § 21651(b).
2. Evidentiary Deficiencies Under Evidence Code § 1280
Furthermore, Mr. Ruff challenged the admissibility of the officer’s written narrative on the DS 367 form. Under California Evidence Code § 1280, police statements are hearsay unless they record direct, objective sensory observations rather than legal conclusions.
Attorney Ruff demonstrated that stating a driver was “violating CVC 21651(b)” without detailing physical street signs (such as “DO NOT ENTER” or “ONE WAY” markers) or street geometry constituted an inadmissible legal opinion, rendering the officer’s statement incompetent to support the stop.
The Result: Complete Set-Aside of the DMV Order
Following the submission of the legal brief and geographical evidence, the DMV Driver Safety Office ruled in favor of Attorney Matthew Ruff’s client.
On November 9, 2026, the Department officially issued an Order of Set Aside, completely rescinding the administrative driver’s license action. The client’s driving privileges were cleared for full reinstatement without an administrative suspension on their record.
Key Takeaways for Anyone Facing a California DUI
- High BAC Results Do Not Mean Automatic Guilt: Even when chemical test results show a high BAC (such as 0.20%), a skilled DUI defense attorney examines every step of the police investigation to ensure constitutional protections were respected.
- The Initial Stop Matters: If law enforcement pulls you over based on an incorrect interpretation of traffic laws, any evidence gathered afterward—including blood samples and field sobriety tests—can be rendered inadmissible.
- Experience Makes the Difference: Defending a DUI with priors requires an attorney who understands both scientific testing standards and statutory highway definitions.
With over 30 years of specialized experience in DUI defense across Southern California, Drunk Driving Defense Attorney Matthew Ruff continues to fight for clients by holding law enforcement and administrative agencies to the highest legal standards.
