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.

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.

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.

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. You can use the free written case analysis below or call me directly. 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).