There is a critical difference between declining a roadside test and refusing the official test after you are arrested. The post-arrest chemical test is the one that carries real penalties for refusing, under California's implied consent law. I am Joel Brand, and here is what a post-arrest blood or breath test refusal means and how it can be challenged.

Why people refuse, and why it backfires

Most refusals are not acts of defiance; they come from confusion. A driver who correctly understands that the roadside field tests are optional often assumes, wrongly, that the station test is optional too, or believes that refusing will deprive the state of evidence. In reality, refusing the post-arrest test usually makes things worse, adding a hard one-year suspension and a sentencing enhancement on top of the DUI, while still leaving the prosecution able to argue impairment from the other evidence. Understanding the difference between the two kinds of tests, before you are ever in that situation, is the best protection against a costly mistake.

The roadside test versus the post-arrest test

Before an arrest, the handheld preliminary alcohol screening (PAS) device and the field sobriety tests are generally optional for drivers 21 and over. Declining those is not a refusal. After a lawful arrest, it is different: under Vehicle Code 23612, you are deemed to have already consented to an evidentiary breath or blood test, and refusing that test is what triggers the refusal penalties. Confusing the two is one of the most costly mistakes people make, because the same instinct that correctly tells you the roadside tests are optional leads people to wrongly decline the one test that is not.

What a refusal costs

  • A one-year license suspension with no restricted-license option, longer than the suspension for a standard first DUI, under Vehicle Code 13353.
  • A sentencing enhancement if you are convicted, adding mandatory jail and a longer program.
  • Evidence against you, since the prosecutor can argue you refused because you knew you were over the limit.

Why the penalties are so harsh

The point of these stiff penalties is deterrence: the state wants to discourage drivers from defeating its evidence by refusing to be tested, so it makes refusing more painful in some respects than failing. The one-year hard suspension with no restricted license is especially severe, often harder on daily life than the suspension that follows an ordinary first-offense conviction. And because the refusal becomes its own piece of evidence and its own enhancement, an allegation of refusal roughly doubles what is at stake, layering a second serious problem on top of the underlying DUI.

When a "refusal" is not really one

Officers write "refused" more often than the law supports. A valid refusal requires that everything was done correctly, and frequently it was not:

  • The arrest was unlawful. Implied consent applies only after a lawful arrest.
  • You were not properly admonished. The officer must clearly warn you of the consequences of refusing; a garbled or skipped admonition undercuts the refusal.
  • Confusion about your rights. If you reasonably believed you could speak to a lawyer first, that confusion can defeat the refusal.
  • Medical inability. A genuine inability to complete a breath test is not a willful refusal, and the officer should offer the alternative.

These cases turn on procedure. See common police mistakes during a refusal.

Hesitation and confusion are not refusal

The law requires a willful refusal, not mere hesitation, and officers sometimes log a refusal the moment a driver pauses, asks a question, or requests clarification. A driver who is trying to understand the choice, who asks whether breath or blood is required, or who needs the admonition repeated has not necessarily refused anything. The Miranda warning given moments earlier frequently creates exactly this confusion, telling a person they have the right to a lawyer and then demanding a test without one, and when the officer fails to clear up that confusion, a driver's hesitation should not be treated as a willful refusal. The body-cam and dash-cam footage usually reveal what actually happened far better than the officer's one-word conclusion.

You choose breath or blood

When a test is required, you generally have a choice of breath or blood. A blood test preserves a sample that an independent expert can later retest, and it opens the door to chain-of-custody and storage challenges. What you cannot do is decline both. If the officer mishandled that choice, failing to offer the alternative, or treating a problem with one test as a refusal rather than offering the other, it is something I examine closely, because that mishandling can defeat the refusal allegation.

The DMV runs separately

The refusal suspension is handled by the DMV on its own track, and the refusal allegation can be contested at the DMV hearing, which you must demand within 10 days of the arrest. Because the refusal has to be fought on both the criminal and administrative fronts at once, and because the DMV deadline is so short, acting quickly is essential. The same defects, an unlawful arrest, a defective admonition, the confusion doctrine, a medical inability, can be raised in both forums. See my top DUI defenses.

Refusal still leaves the DUI to be fought

An important point that gets lost is that a refusal does not make the underlying DUI a sure thing. Without a chemical number, the prosecution has to prove impairment through the officer's observations, the driving pattern, and the field tests, all of which are contestable. In some cases the absence of a test result actually leaves the impairment case thinner than it would have been with a number, even as the refusal allegation adds its own penalties. So the strategy has two parts: defeat or undercut the refusal allegation itself, and separately attack the DUI on the evidence that remains. Both fronts matter, and they are fought together.

Accused of refusing? Let's look at it.

A refusal allegation roughly doubles what is at stake, the suspension, the enhancement, and the evidentiary argument, which is why it deserves a careful, skeptical review of exactly what the officer did and said. Use the free case analysis on this page, or call me directly at (888) 271-6644. I answer my own phone, 24/7.

From the DUI blog: Can you refuse a breathalyzer in California?.

From the DUI blog: Taken to the Hospital After Your DUI Arrest? What That Blood Draw Means for Your Case.

From the DUI blog: Arrested for DUI in California but Never Offered a Breathalyzer at the Station: What That Means.