Sonoma County DUI Attorney 

Arrested for DUI anywhere in Sonoma County? Every case runs through the Superior Court in Santa Rosa, and every defense starts with the same ten-day clock.

A DUI arrest in Cotati, Petaluma, Rohnert Park, Windsor, Sonoma, or Healdsburg all ends up in the same courthouse. The Superior Court of Sonoma County, at the Hall of Justice on Administration Drive, hears every misdemeanor and felony DUI filed in the county. It does not matter which agency made the arrest.

California drivers have 10 calendar days from arrest to request an administrative hearing at the California DMV. Miss it, and the license suspension takes effect on the 31st day. That deadline runs whether the arresting agency was the Sonoma County Sheriff's Office, the Petaluma Police Department, or the California Highway Patrol.

The Law Offices of Evan E. Zelig, P.C. defends DUI cases countywide. Attorney Evan E. Zelig is a member of the National College for DUI Defense. He has been named to Super Lawyers each year from 2022 through 2026. Avvo has recognized him with the Clients' Choice Award in 2024 and 2025.

The practice is boutique by design: a small caseload, deep preparation, and one attorney on every case.

DUI Enforcement Across Sonoma County

Sonoma County covers just over 1,700 square miles. Coast, valley, and forest all fall inside county lines. The DUI enforcement footprint reflects that geography.

The patterns differ across the county. The Highway 101 corridor is one enforcement zone. The coastal state routes and the two-lane wine country roads are others.

The agencies that make DUI arrests

The Sonoma County Sheriff's Office patrols the unincorporated areas. That includes coastal communities from Bodega Bay through Jenner and the Russian River area around Guerneville. Deputies also work the eastern edge of the county around Kenwood and Glen Ellen. Substations sit in Windsor, Sonoma, and Guerneville.

The Santa Rosa Police Department patrols within the city. Santa Rosa is by far the largest city in the county. SRPD makes more DUI arrests in an average year than any other agency in Sonoma County.

Its DUI enforcement team runs saturation patrols and checkpoints. Common hot spots include downtown Fourth Street, Mendocino Avenue near the college, and Highway 12.

The California Highway Patrol operates Santa Rosa Area and Rincon Valley offices in the county. CHP patrols the state highways. That means U.S. 101 from Petaluma through Cloverdale, State Route 12 from Sebastopol through Sonoma, State Route 116, and State Route 1.

CHP handles a substantial share of Sonoma County DUI arrests. Those highways are where the enforcement is heaviest.

Each incorporated city also runs its own DUI enforcement. Petaluma Police, Rohnert Park Public Safety, Cotati Police, Sebastopol Police, Windsor Police, Healdsburg Police, and Cloverdale Police all make arrests within their jurisdictions. Regardless of the agency, every case is filed in the Sonoma County District Attorney's Office and heard at the Hall of Justice in Santa Rosa.

Checkpoints and saturation patrols

Sonoma County agencies operate DUI/driver's license checkpoints throughout the year. Many are funded by California Office of Traffic Safety grants. Checkpoints in Santa Rosa often appear on Mendocino Avenue, Sebastopol Road, and Stony Point Road. Petaluma checkpoints commonly show up on East Washington Street and Petaluma Boulevard.

Windsor and Healdsburg checkpoints run along Old Redwood Highway and Healdsburg Avenue. The CHP runs saturation patrols along U.S. 101 and State Route 12. Enforcement peaks on holiday weekends and during the wine country tourist season.

California DUI checkpoints must comply with the standards in Ingersoll v. Palmer (1987) 43 Cal.3d 1321. Those include advance publication, supervisor authorization, a neutral stopping formula, adequate marking, safe location selection, and minimally intrusive detention. Checkpoints that fail those requirements are subject to suppression under Penal Code § 1538.5.

Saturation patrols work differently. Instead of stopping every driver at a fixed point, extra officers patrol a defined area for specific violations. Each stop still requires reasonable suspicion. The traffic-stop justification is often the point at which the defense finds leverage.

Where the arrests are concentrated

Arrests can happen anywhere in the county. Historical data shows clusters along the Highway 101 corridor from Petaluma through Windsor. Highway 12 between Santa Rosa and Sonoma is another hot spot. So is the area around the restaurants and tasting rooms in downtown Santa Rosa, Sonoma Plaza, and Healdsburg Plaza.

Russian River recreation weekends are their own category. Drivers head home along State Routes 116 and 12. Coastal agencies stage return-traffic patrols on Sunday evenings.

California DUI Law: The Two-Track Structure

California DUI law runs two proceedings on one arrest. The DMV handles the license case under Vehicle Code § 13353. The Superior Court handles the criminal case under Vehicle Code §§ 23152 and 23153. Each track has its own rules, its own standard of proof, and its own outcomes.

The DMV case does not depend on the criminal outcome. The criminal case does not depend on the DMV outcome. A driver can lose the DMV hearing and still get the criminal case dismissed. Building a defense on both fronts from day one is what makes it possible to protect the license and contest the charge at the same time.

The DMV administrative case

At the DMV Administrative Per Se hearing, three questions are decided by preponderance of the evidence:

• Did the officer have reasonable cause to believe the driver was under the influence?
• Was the driver lawfully arrested?
• Was the BAC 0.08 percent or more at the time of driving? (Or 0.04 percent for commercial drivers, 0.01 percent under Vehicle Code § 23136 for drivers under 21.)

If the answer to all three is yes, the DMV imposes the license suspension. A first offense carries a 4-month suspension. Restricted license eligibility opens after 30 days.

A second offense within 10 years is 1 year, with restricted eligibility after 90 days. Third or more offenses carry escalating durations under Vehicle Code § 13352. A refusal produces a longer track: 1 year on a first refusal, 2 on a second, and 3 on a third.

The APS hearing matters beyond the license question. It is the first chance to lock in the arresting officer's sworn testimony. It also opens up the calibration and maintenance records for the breath machine used.

Even in cases the DMV ultimately decides against the driver, the record built at the hearing often turns up material the defense uses to challenge the criminal case.

The criminal case

Vehicle Code § 23152 defines two ways to commit a DUI:

• Subsection (a), "under the influence": The driver's ability to operate the vehicle with the caution of a sober person was appreciably impaired by alcohol, a drug, or both. Impairment is proved by the officer's observations, the field sobriety tests, driving behavior, and other circumstantial evidence.
• Subsection (b), the per se offense: The driver had a BAC of 0.08 percent or more at the time of driving. This is proved by the chemical test.

Prosecutors in Sonoma County file both counts together. A jury can convict on either theory. When the chemical test result is weak or excluded, the case shifts to the (a) count. That is when the prosecution's job of proving impairment without a number gets substantially harder.

Related sections cover specific driver categories. Vehicle Code § 23152(d) sets the limit at 0.04 percent for commercial drivers. Vehicle Code § 23152(e) sets it at 0.04 percent for rideshare, taxi, and limousine drivers when a passenger is in the vehicle. Vehicle Code § 23152(f) covers driving under the influence of any drug, including cannabis.

Vehicle Code § 23140 covers drivers under 21 with a BAC of 0.05 percent or more. Vehicle Code § 23153 covers DUI causing injury to another person. That last charge can be filed as either a misdemeanor or a felony depending on the extent of the injury and the driver's history.

DUI Penalties in Sonoma County

California DUI penalties escalate with priors and with aggravating facts. What follows describes the statutory exposure. Actual sentences depend on the facts, the strength of the prosecution's evidence, the defendant's history, and what the defense is able to negotiate.

The statutory ranges are the starting point for every discussion.

The 10-year lookback

California uses a 10-year lookback period to count prior DUI convictions for enhancement purposes. Under Vehicle Code § 23540, § 23546, and § 23550, a "prior" is any DUI conviction, wet reckless conviction under Vehicle Code § 23103.5, or out-of-state equivalent within 10 years of the current offense date.

The lookback runs from offense date to offense date, not conviction date to conviction date. A DUI arrest in July of one year and a second arrest in June ten years later falls inside the lookback. A DUI arrest in July and a second arrest in August ten years later does not.

For felony DUI purposes under Vehicle Code § 23550.5, a prior felony DUI counts regardless of when it occurred. There is no 10-year washout for a felony prior. That is one of the reasons striking a prior can materially change the exposure on a new case.

First-offense DUI (Vehicle Code § 23536)

A standard first-offense DUI in California is a misdemeanor charged under Vehicle Code § 23536.

• Jail: 96 hours to 6 months in the Sonoma County Main Adult Detention Facility. A straightforward first offense with a BAC under 0.15 and no aggravating facts usually resolves without custody time. The court imposes probation with standard alternative sanctions instead. Aggravating facts change the analysis quickly.
• Fine: $390 to $1,000 statutory. Penalty assessments raise the total to roughly $1,800 to $3,600 in most cases.
• License suspension (criminal court): 6 months under Vehicle Code § 13352. This runs concurrently with the 4-month APS suspension imposed by the DMV.
• License suspension (DMV/APS): 4 months, with restricted license eligibility after 30 days.
• DUI program: Three months (30 hours) under AB 541 for a BAC below 0.20. Nine months under AB 762 for a BAC of 0.20 or higher. Local providers include Drug Abuse Alternatives Council and DrinkingDriver Programs of Sonoma County.
• Probation: Three to five years of summary (informal) probation. Standard terms include no driving with any measurable alcohol, no refusing a chemical test if arrested again, and no committing any new offense.
• Ignition interlock device (IID): Required for up to 6 months for full license restoration under Vehicle Code § 23575.3. See our ignition interlock device guide.
• SR-22: Proof of financial responsibility, filed with the DMV for 3 years.

Sonoma County process specifics. First-offense misdemeanor cases are filed in the Sonoma County Superior Court's Criminal Court division at the Hall of Justice. The Sonoma County District Attorney's Office assigns misdemeanor DUIs to the misdemeanor calendar, with arraignments generally set 4 to 8 weeks out from the arrest date. Under Penal Code § 977, an attorney can appear on the defendant's behalf at most first-offense court dates without the client being present.

Alternative sentencing on a first offense in Sonoma County typically runs through the Sheriff's Alternative Sentencing Bureau. That includes work release (SWAP), electronic monitoring, and sheriff's parole eligibility for qualifying defendants. Community service through Sonoma County's approved provider list is another common component of a first-offense probation package.

Enhancements on a first offense

Several facts trigger mandatory add-ons even on a first offense.

• BAC of 0.15 percent or higher: Longer DUI program (9-month AB 762) under Vehicle Code § 23538, enhanced fines, and additional probation conditions. A BAC of 0.20 or higher can also trigger a longer IID requirement.
• Chemical test refusal: Adds a 1-year DMV suspension separate from the APS process under Vehicle Code § 13353. In the criminal case, the prosecution introduces the refusal as consciousness of guilt and Vehicle Code § 23577 adds additional jail time.
• Excessive speed: Under Vehicle Code § 23582, a DUI committed at 20 mph or more over the limit on a surface street, or 30 mph or more over the limit on a highway, adds a mandatory 60 days in county jail plus safe driving courses.
• Child in the vehicle under 14: Under Vehicle Code § 23572, adds mandatory jail time of 48 hours for a first offense, escalating with priors. In some cases the district attorney also files a child endangerment charge under Penal Code § 273a. See our page on DUI with a child in the car.
• Collision: A DUI with a collision, even without injury, increases the likelihood of a jail-time recommendation from the prosecution and can trigger a restitution obligation to any damaged parties.

Second-offense DUI (Vehicle Code § 23540)

A second DUI within 10 years is charged under Vehicle Code § 23540. See our page on multiple DUI offenses.

• Jail: 96 hours to 1 year. The 96-hour minimum is mandatory unless the court finds an unusual case in the interest of justice under Vehicle Code § 23542. Most Sonoma County second offenses involve some custody time. That is often served through the Sheriff's Alternative Sentencing Bureau on work release, weekender custody, or electronic monitoring where the client qualifies.
• Fine: $390 to $1,000 plus assessments, raising the total to roughly $1,800 to $3,900 in most cases.
• License suspension (criminal court): 2 years under Vehicle Code § 13352. Restricted license eligibility begins after 90 days of hard suspension with IID installation.
• License suspension (DMV/APS): 1 year, with restricted license eligibility after 90 days with IID.
• DUI program: 18 months (AB 1353), the multiple offender program.
• Probation: Three to five years summary.
• IID: Required for up to 1 year on a restricted license under Vehicle Code § 23575.3.
• SR-22: 3 years.

Sonoma County process specifics. Second offenses in Sonoma County typically involve stricter probation terms than first offenses, including alcohol testing conditions in some cases. The Sonoma County Superior Court has a DUI Court program for repeat offenders who qualify. Participation is voluntary and involves intensive supervision, treatment, and regular judicial review over 18 to 24 months.

Second-offense sentencing in Sonoma County also frequently includes attendance at a Mothers Against Drunk Driving (MADD) Victim Impact Panel. The Sheriff's Alternative Sentencing Bureau administers most of the alternative-custody options, though eligibility is narrower on a second offense than a first.

Third-offense DUI (Vehicle Code § 23546)

A third DUI within 10 years is charged under Vehicle Code § 23546.

• Jail: 120 days to 1 year, with a 120-day mandatory minimum under Vehicle Code § 23548. This is the point at which meaningful custody time is expected on a plea. It is also where contesting one of the prior convictions, factually or constitutionally, can materially change the outcome.
• Fine: $390 to $1,000 plus assessments.
• License revocation: 3 years under Vehicle Code § 13352, with habitual traffic offender designation under Vehicle Code § 14601.3.
• License suspension (DMV/APS): 1 year, with restricted eligibility rules that vary based on prior refusal history.
• DUI program: 30 months (SB 1176), the extended multiple offender program.
• Probation: Three to five years.
• IID: Required for up to 2 years on any restricted license.

Sonoma County process specifics. Third-offense DUIs are handled on the misdemeanor calendar but receive substantially more scrutiny from the DA's office. Standard practice in Sonoma County is a mandatory-minimum jail recommendation absent significant mitigation. Motions to strike a prior become the primary defense lever, since striking either of the two priors moves the case down a full sentencing tier.

Alternative custody on a third offense is available in Sonoma County but limited. Work release and electronic monitoring can substitute for a portion of the 120-day minimum where the client qualifies, but the full alternative-custody substitution common on first offenses is not typical.

Fourth-offense DUI (felony, Vehicle Code § 23550)

A fourth DUI within 10 years is a felony under Vehicle Code § 23550. The case moves from county jail exposure to state prison exposure. Statutory prison range is 16 months, 2 years, or 3 years.

In some circumstances the case can still be prosecuted alternatively as a misdemeanor. A prior felony DUI conviction on the record makes any subsequent DUI a felony under Vehicle Code § 23550.5, regardless of the 10-year window.

Sonoma County process specifics. Felony DUIs are filed in the felony calendar at the Hall of Justice. The case begins with a felony arraignment, moves through a preliminary hearing under Penal Code § 872, and, if held to answer, proceeds to a felony trial calendar. The defendant's personal appearance is required at most stages under Penal Code § 977(b) unless the court makes a specific finding otherwise.

Post-realignment (AB 109), non-serious felony DUIs are often eligible for county-jail sentences under Penal Code § 1170(h) rather than state prison. That preserves alternative-custody options that state prison forecloses.

DUI causing injury (Vehicle Code § 23153)

A DUI that causes injury to a person other than the driver is a "wobbler." It can be charged as either a misdemeanor or a felony. The choice is at the prosecutor's discretion.

Factors pushing toward a felony filing include the severity of the injury, the driver's BAC, prior DUI history, and the driver's conduct at the scene.

• Misdemeanor exposure: 5 days to 1 year in county jail, plus the standard DUI penalties.
• Felony exposure: 16 months, 2 years, or 3 years in state prison. With great bodily injury enhancements under Penal Code § 12022.7, an additional 3 to 6 years. Multiple-victim enhancements can stack further under Vehicle Code § 23558.

Restitution to the injured victim and to any insurance carrier that paid a claim is mandatory. Restitution in a felony DUI can run into six figures or higher. Civil exposure runs in parallel and is not limited by the criminal restitution amount.

Gross vehicular manslaughter while intoxicated

A DUI causing a fatality can be charged as gross vehicular manslaughter while intoxicated under Penal Code § 191.5(a). Or as vehicular manslaughter while intoxicated under Penal Code § 191.5(b) where gross negligence is not shown. The § 191.5(a) charge carries a state prison range of 4, 6, or 10 years. It is a strike offense under California's Three Strikes Law.

A driver with two prior DUI convictions who is charged with vehicular manslaughter while intoxicated faces potential filing under People v. Watson (1981) 30 Cal.3d 290. That means second-degree murder, with a state prison term of 15 years to life.

These cases are the most serious in the entire California DUI system. They call for a defense team prepared to take them to trial.

Wet reckless and dry reckless reductions

California recognizes two commonly negotiated reductions from a DUI charge. Both are codified in Vehicle Code § 23103.

• "Wet reckless" under § 23103.5: A reckless driving conviction with an admission that alcohol or drugs were involved. No mandatory jail time. No court-imposed license suspension. A shortened 12-hour DUI program instead of the AB 541 30-hour program. No ignition interlock requirement. However, a wet reckless still counts as a prior DUI for enhancement purposes if the driver is arrested for DUI again within 10 years. The DMV can also still impose an APS suspension based on the underlying BAC evidence.
• "Dry reckless": A straight reckless driving conviction with no alcohol admission. Substantially better than a wet reckless. There is no prior for DUI enhancement and no APS suspension from the DMV. Available only when the prosecutor concludes the DUI evidence is genuinely weak.

Whether a wet or dry reckless is available on a given case depends on several factors. Those include the strength of the prosecution's evidence, the driver's prior record, and the specifics of the stop and arrest.

Cases with a BAC of 0.10 or lower, a plausible traffic-stop challenge, borderline field sobriety tests, or a Title 17 violation on the breath testing tend to be candidates. Cases with a very high BAC, an accident, a refusal, or a fresh prior are rarely reduced.

Collateral consequences

Beyond the criminal sentence, a DUI conviction carries collateral consequences that can outlast probation.

• Auto insurance: SR-22 filings and premium increases typically extend for at least 3 years, often longer. Some carriers non-renew after a DUI conviction.
• Employment: Employers requiring a driver's license or a commercial driver's license as a condition of employment can terminate on a DUI conviction. Some professional employers reserve the right to consider criminal records at hire or renewal.
• Professional licensing: The State Bar of California, the Medical Board of California, the Board of Registered Nursing, the Board of Pharmacy, and the Bureau of Real Estate all treat DUI convictions as reportable conduct. Each can open independent disciplinary proceedings that outlast the criminal case.
• Commercial driver's license: One-year suspension of the CDL on a first DUI in any vehicle. Lifetime revocation on a second, under federal rules that California implements.
• Immigration: DUI convictions involving drugs, injury, or a pattern of offenses can carry immigration consequences for non-citizens. Those include inadmissibility findings and removal proceedings.
• Public benefits and housing: Some public housing and certain federal benefits treat DUI conviction records as part of eligibility screening.

Many of these collateral consequences can be limited. Working the criminal case toward a plea that avoids the triggering language is one route. Keeping the offense off the record through diversion or dismissal, where available, is another.

Post-conviction relief under Penal Code § 1203.4, commonly called expungement, is often available at the end of a successful probation term. It removes the conviction for most private-employment purposes. It does not undo the DMV enhancement effect or a federal CDL suspension.

The Court Process at Sonoma County Superior Court

Every DUI case filed in Sonoma County Superior Court moves through the same courthouse. Misdemeanor and felony alike. Roughly the same sequence of appearances applies to both.

Understanding the steps helps set expectations and identifies where the defense has room to act.

Filing and arraignment

The Sonoma County District Attorney's Office files misdemeanor DUI cases in the Criminal Court division at the Hall of Justice, 600 Administration Drive in Santa Rosa. Felony DUI cases are filed in the felony calendar. Arraignment is the first formal court appearance. The court reads the charges, takes a plea (usually not guilty), addresses bail if not already resolved, and sets the next date.

Under Penal Code § 977, an attorney can appear on the defendant's behalf at most misdemeanor court dates. The client does not have to be present. That covers the arraignment, most pretrial conferences, and pretrial motion hearings.

Felony cases require the defendant's personal appearance at most stages. That includes arraignment, preliminary hearing, and any trial date, unless the court finds otherwise.

Discovery and pretrial motions

After arraignment, the defense receives discovery. That includes the police reports and the chemical test result. It also includes the maintenance and calibration records for the machine that produced the test, body-worn camera footage, and any dashcam video.

Other discovery items include the arresting officer's DUI training records, statements by any witnesses, and any prior contact reports the defense specifically requests. The California Public Records Act and Pitchess motions (Evidence Code §§ 1043 and 1045) can be used to obtain arresting officer personnel records where credibility is at issue.

Pretrial motions are where the defense can challenge the case before trial.

• Motion to suppress under Penal Code § 1538.5: Challenges the traffic stop, the roadside detention, the FSTs, or the chemical test as products of a Fourth Amendment violation.
• Motion to suppress the chemical test under Title 17: Challenges the chemical test on the ground that California Code of Regulations, Title 17, § 1221.4 was not complied with (15-minute observation, blood-draw protocol, machine maintenance).
• Motion in limine: Excludes specific evidence at trial. Examples include the officer's opinion of impairment based on FSTs, or the driver's silence at the scene.
• Motion to strike a prior conviction: In cases with prior DUI convictions used to enhance the current charge, the defense can challenge the constitutional validity of the prior plea if the record shows an inadequate advisement of rights.

A successful pretrial motion is often the point at which a case that looked like a conviction becomes a dismissal or a reduction.

Pretrial conferences and disposition

If the case is not resolved on pretrial motions, it moves to pretrial conferences. These are conversations between the prosecution and the defense, with input from the court, about how the case should be resolved. Everything relevant is on the table.

The strength of the defense case, the priors, the aggravating and mitigating facts, and the client's specific interests all bear on what a fair outcome looks like.

Most misdemeanor DUI cases in Sonoma County resolve at a pretrial conference. Cases that do not resolve go to a trial-setting date. Then to a trial-readiness conference before the actual trial calendar.

Trial

A California DUI trial is a jury trial. The jury is 12 people unless waived. Selection is done by the court and counsel through the Batson/Wheeler voir dire procedure.

The prosecution presents its case first: usually the arresting officer, any witnesses, and the criminalist who tested the blood sample or maintained the breath machine. The defense cross-examines each witness. It may present its own case, including expert testimony on breath testing science, blood testing science, field sobriety test administration, or specific medical conditions.

Closing arguments precede jury deliberation. The jury must be unanimous to convict. A hung jury results in a mistrial and either a retrial or a resolution short of retrial. An acquittal ends the case for good.

Sentencing

If the case ends in a plea or a conviction at trial, sentencing follows. In misdemeanor cases, sentencing often happens the same day as the plea. It can be continued for a full sentencing hearing when there is a factual dispute about aggravating or mitigating facts. In felony cases, sentencing follows a probation officer's presentence report and a formal sentencing hearing.

Even at sentencing, the defense has room to move. Presentation of mitigation matters. That includes the client's history, the client's rehabilitation efforts, and the specific facts of the case.

All of it can shift the sentence within the statutory range. In serious felony cases, defense sentencing memoranda can influence the decision between the low term and the middle term of state prison.

How a DUI Defense Case Is Built

Every DUI case is different. But the way a defense is prepared follows a consistent pattern. That preparation is what makes it possible to identify the strongest defenses early. It is also what makes it possible to file the right motions and to negotiate from a position of factual strength rather than hope.

First seven days

The first week matters more than any other. In those seven days, the defense attorney:

• Requests the DMV APS hearing to preserve the license and open discovery on the DMV side.
• Sends a preservation letter to the arresting agency for body-worn camera footage, dashcam footage, and dispatch recordings.
• Requests the initial police report and any available lab report from the DA's office.
• Obtains the calibration and maintenance records for the breath machine used, or the chain of custody documentation for a blood sample.
• Interviews the client in detail on timing of drinks, food, medical history, medications, sleep, activity before driving, the traffic stop, the FSTs, the officer's specific words and conduct, the transport, the chemical test, and the booking.

The information collected in that first week frames everything the defense does later.

The technical review

Once discovery arrives, the defense conducts a technical review. That includes:

• Reviewing the traffic-stop justification against the specific vehicle code sections cited.
• Comparing the officer's written report against the body-worn camera footage frame by frame for FST administration, verbal exchanges, and the reading of chemical test admonitions.
• Reviewing breath machine maintenance records against Title 17 requirements. That covers calibration date, accuracy verification, control samples, and the machine's error history.
• Reviewing blood-draw documentation for anti-coagulant and preservative content, chain of custody, storage temperature, and lab analysis protocol.
• Identifying any medical conditions or medications that could produce false-positive readings.

Motion practice

The technical review produces a list of potential motions. Any one of them, if granted, can end the case. The most common in a Sonoma County DUI defense:

• Motion to suppress the stop: Under People v. Butler (1988) 202 Cal.App.3d 602 and its progeny, a stop based on speculation or on a violation the driver did not commit is unlawful.
• Motion to suppress the chemical test under Title 17: Any material violation of § 1221.4 can lead to exclusion.
• Motion to strike a prior: If a prior DUI plea was taken without a complete waiver of rights under Boykin v. Alabama (1969) 395 U.S. 238 and In re Tahl (1969) 1 Cal.3d 122, the prior may not be counted for enhancement.

Negotiation and trial preparation

Where motions do not end the case, the negotiation phase begins. The negotiation is stronger when the defense has already built the trial file. Prosecutors handle DUI cases at scale.

When they see a defense that has already lined up the technical challenges and the expert witnesses, they think differently about the case. The negotiated outcome often reflects the trial risk the prosecution sees, not the paper strength of the case.

Cases that do not resolve on negotiation move to trial. At that point the defense is either taking on the chemical test, taking on the FSTs, or taking on the "under the influence" theory. Each approach usually involves a defense expert.

Each aims to show that the driver's observed conduct was consistent with sobriety.

Sonoma County Areas Served

The firm serves DUI clients from every part of Sonoma County. The court venue is the same everywhere: the Superior Court of Sonoma County in Santa Rosa. Where the arrest happened does not change that.

The location of the traffic stop does not limit access to a Santa Rosa-based defense attorney.

South county cases

Cases handled include DUI arrests arising in:

• Petaluma: Highway 101 and East Washington Street stops, plus cases from downtown Petaluma restaurants and the Lakeville Highway corridor.
• Rohnert Park: Highway 101 and Rohnert Park Expressway stops, plus cases from Sonoma State University area enforcement.
• Cotati: Old Redwood Highway and Highway 116 stops.
• Penngrove: Old Redwood Highway and Petaluma Hill Road cases.

Central and west county cases

• Sebastopol: Highway 12 and Highway 116 stops, plus cases arising in downtown Sebastopol.
• Glen Ellen: Highway 12 stops through the wine country corridor.
• Bodega and Bodega Bay: Highway 1 and coastal Sonoma County stops.

North county cases

• Windsor: Old Redwood Highway and Windsor River Road stops.
• Healdsburg: Cases arising in downtown Healdsburg, on Healdsburg Avenue, and in the surrounding tasting-room district.
• Geyserville: Highway 101 and the northern reaches of the county.

How consultations work

The office is centrally located in downtown Santa Rosa, a short walk from the Hall of Justice. Clients from any of the areas above are seen in person at the office. Where distance or circumstances require it, phone or video consultation is available.

Whichever way the initial meeting happens, the case is handled from the same office through disposition.

Why Choose Attorney Evan Zelig for a Sonoma County DUI Case

Sonoma County DUI defense rewards attention to the specific evidence in the specific case, not case volume.

That means the maintenance record of the specific breath machine, the body-worn camera footage from the specific officer, and the calibration date on the specific PAS device. The Law Offices of Evan E. Zelig, P.C. is structured around that principle.

A boutique practice by design

The caseload is deliberately limited. Every case gets the technical review, the motion analysis, and the negotiation preparation that DUI defense requires. Every case is handled by an experienced attorney from arraignment to trial calendar.

The client is not passed to a rotating cast of associates. The person who signs the case is the person who argues the motion to suppress.

Credentials and memberships

Attorney Evan E. Zelig is a member of the National College for DUI Defense. Membership is limited and reflects a genuine specialization in DUI law.

He has been named to the Super Lawyers list every year from 2022 through 2026. Avvo has recognized him with the Clients' Choice Award in both 2024 and 2025.

He is admitted to the State Bar of California and to the U.S. District Courts for the Northern, Eastern, Central, and Southern Districts of California. He is a member of the California Public Defender Association, the National Association of Criminal Defense Lawyers, California Attorneys for Criminal Justice, the Sonoma County Bar Association, the Napa County Bar Association, and the American Bar Association. He also serves on the legal committees of NORML and California NORML.

Consultations in English or Spanish

Consultations and case discussions are handled in English or Spanish. Attorney Zelig is with you through every step of the criminal defense process. That includes the DMV clock at the front end and any post-conviction expungement work at the back end.

Frequently Asked Questions About Sonoma County DUI Defense

Talk to a Sonoma County DUI Attorney

If you have been arrested for DUI in Petaluma, Santa Rosa, Windsor, Healdsburg, or anywhere else in Sonoma County, call (707) 636-3204 to request a consultation with Attorney Evan E. Zelig.

The DMV's 10-day clock is running from the date of arrest. The sooner the defense is engaged, the sooner the license and the case can be protected.

Law Offices of Evan E. Zelig, P.C. 50 Old Courthouse Square, Suite 407 Santa Rosa, CA 95404