A fourth DUI within ten years is the point where California stops treating the case as a misdemeanor. Under Vehicle Code 23550, a fourth qualifying offense can be charged as a felony, which brings state prison exposure and a much longer license revocation. It is a serious charge, but a felony filing is not the end of the story, and the priors that make it a felony are often where the defense begins. I am Joel Brand, and here is how I approach a fourth-offense DUI.

A felony filing is not a foregone conviction

The word felony understandably frightens people, but a felony filing is the prosecution's starting position, not the final outcome. The case still has to be proven, the priors still have to qualify, and the same defenses that apply to any DUI, the stop, the testing, the chemical evidence, apply here. Many fourth-offense cases end as misdemeanors or with sentences well below the maximum once the priors are tested and the current case is challenged. Treating the felony filing as the inevitable result, rather than the beginning of a fight, is the mistake to avoid.

Why the fourth offense becomes a felony

California counts DUI priors over a ten-year window. Once you have three qualifying prior convictions within that period, a new DUI can be filed under Vehicle Code 23550 as a felony. A prior felony DUI, or a prior DUI causing injury, can also elevate a later case. The entire felony exposure rests on those prior convictions counting, which is exactly why each one has to be examined rather than assumed.

What a felony fourth offense carries

On a felony fourth offense, the statutory exposure includes:

  • State prison, rather than county jail, depending on the facts and your record.
  • A four-year revocation of your driving privilege from the DMV, with ignition interlock requirements.
  • A designation as a habitual traffic offender, which carries its own penalties for driving on a revoked license.
  • An 18-month or 30-month licensed DUI program, formal probation, fines and fees, and treatment conditions.

A felony conviction also carries lasting collateral consequences for employment, firearm rights, and professional licensing that a misdemeanor does not.

The priors are the heart of the case

Because the felony depends entirely on the prior convictions, those priors are the first thing I examine. A prior may not qualify if it was not actually a DUI, if it falls outside the ten-year window, or if it was obtained without a valid waiver of the defendant's rights. If even one prior can be removed from the count, the case may drop below the felony threshold and be treated as a misdemeanor, which changes everything about the exposure. This is detailed in challenging priors in a DUI case, and it is where I focus first in any fourth-offense matter.

How a prior gets knocked out

Knocking out a prior is concrete work. I order the transcripts and court records from the earlier case and look for a missing or defective waiver of the right to a jury trial, to confront witnesses, and against self-incrimination; a denial of counsel; a defective immigration advisement; or a prior that simply does not qualify, such as an out-of-state conviction whose conduct would not be a DUI in California. A motion to strike under Penal Code 1385 then asks the court to remove the prior from the count. Because old cases are frequently poorly documented, the prosecution cannot always prove a prior is valid, and that gap is the defense's opening.

Reducing the charge and the sentence

Even where the priors hold, a felony DUI is a wobbler in many configurations, and there are paths to reduce it under Penal Code 17(b) or to resolve it in a way that avoids prison. Treatment, documented sobriety, and a credible plan carry real weight at this level, because the difference between the floor and the ceiling of a felony sentence is large. The current DUI is also challenged on the usual grounds, the stop, the testing, and the chemical evidence, since a weak underlying case improves every other part of the negotiation.

Why the underlying issue cannot be ignored

A fourth DUI usually signals a genuine struggle with alcohol, and courts at this level are acutely focused on whether the pattern will continue. That reality is not only a danger but an opportunity. A defendant who engages seriously with treatment, an assessment, a program, documented sobriety, and presents a credible plan for change gives the court a reason to favor a treatment-oriented resolution over the maximum sentence. At the fourth-offense level, where the stakes include prison, this kind of genuine mitigation can be as important to the outcome as the legal challenges, and I work both sides of the case together from the start.

Misdemeanor versus felony filing

It is worth knowing that a fourth offense is not automatically a felony in every instance; prosecutors have discretion, and some fourth offenses are filed or resolved as misdemeanors depending on the facts and the strength of the priors. That discretion is something a defense can engage with, by demonstrating that a prior is shaky, that the current case has real weaknesses, or that the client has taken serious steps toward treatment. Moving a case from the felony track to the misdemeanor track is one of the central goals at this level, because the difference, prison versus jail, a felony versus a misdemeanor record, firearm and employment consequences, is enormous.

The collateral consequences make it worth fighting hard

A felony DUI conviction reaches far beyond the sentence. It can cost firearm rights, complicate or end certain careers and professional licenses, appear permanently on background checks, and carry immigration consequences for non-citizens. Because these effects are so durable, the work to avoid or reduce a felony, attacking the priors, contesting the current case, and building genuine mitigation, pays off for years. At the fourth-offense level, the goal is not just to minimize the immediate sentence but to protect the rest of your life from the lasting weight of a felony record.

Where to start

A fourth DUI is a felony with prison exposure, and the early work on the priors can change the level of the charge itself, which is why this kind of case rewards getting counsel involved immediately. Use the free case analysis on this page, or call me directly at (888) 271-6644. I answer my own phone, 24/7. It may also help to read about challenging priors in a DUI case and reducing a felony DUI to a misdemeanor under Penal Code 17(b).