Going to Trial for a DUI? Here's What Happens Inside the Courtroom.
Most people charged with DUI have never watched a criminal jury trial. The process can feel intimidating when you don't know what comes next.
This guide walks you through jury selection, opening statements, witnesses, chemical-test evidence, closing arguments, jury deliberations, and the verdict.
What Happens at a DUI Jury Trial?
In a California misdemeanor DUI jury trial, the prosecution presents evidence to a jury that typically consists of 12 people.
The defense can challenge that evidence, cross-examine prosecution witnesses, present admissible defense evidence, and argue that the prosecution has not proven the charged offense beyond a reasonable doubt.
The jury must reach a unanimous verdict to convict or acquit on a charge. If the jury cannot agree, the court may declare a mistrial on that charge.
The defendant does not have to prove innocence or testify. The burden of proof remains with the prosecution.
Explore the Eight Stages of a DUI Jury Trial
Select any stage to see what happens, who participates, and why it matters. The precise order can vary by case and court.
Choose a Trial Stage Above
You'll see a practical explanation of what happens in the courtroom and how that stage fits into a DUI defense.
Watch: What Happens During a DUI Jury Trial?
In this video, I explain the DUI jury-trial process and what defendants can expect when a case proceeds to trial.
General information only. Trial procedure and strategy depend on the charges, evidence, rulings, and court.
What Does the Prosecutor Have to Prove in a DUI Trial?
Two common California DUI charges involve different theories of proof. The exact jury instructions depend on the charges and evidence.
Vehicle Code § 23152(a)
This charge generally requires proof that the defendant drove a vehicle while under the influence of alcohol.
The prosecution may rely on driving observations, officer testimony, field sobriety tests, statements, chemical tests, and other evidence.
A chemical-test result is not the only possible evidence of impairment.
Vehicle Code § 23152(b)
This charge generally requires proof that the defendant drove with a blood-alcohol concentration of 0.08 percent or more by weight.
The timing of the test, reliability of the testing process, and evidence concerning the BAC at the time of driving may become important.
Special rules can apply to certain drivers and other DUI offenses.
The Burden Is Beyond a Reasonable Doubt
The prosecution must prove every element of the charged offense beyond a reasonable doubt.
The defendant is presumed innocent. The defendant does not have to call witnesses, introduce evidence, or testify.
Read: California Vehicle Code § 23152 · CALCRIM 2110 · CALCRIM 2111
What Evidence Can Be Challenged at a DUI Trial?
Select an evidence category to see questions that may matter during investigation, cross-examination, or expert review.
Select an Evidence Category
You'll see questions a defense attorney may investigate. These are potential issues, not assumptions that the evidence is defective.
Challenging a breath or blood test does not automatically defeat every DUI charge. The prosecution may still rely on other evidence to prove an impairment-based offense.
Who Usually Testifies at a DUI Jury Trial?
Arresting Officer
May testify about driving observations, contact with the driver, field sobriety tests, statements, and the arrest.
Chemical-Test Witness
May explain breath or blood testing, procedures, equipment, records, and reported results.
Civilian Witness
May testify about driving, an accident, observations, or events before police arrived.
Defense Expert
When appropriate, an expert may address scientific issues, testing limitations, or the interpretation of evidence.
Defense Witness
May provide relevant observations, timelines, or other admissible evidence supporting the defense.
The Defendant
May testify if the defendant chooses, but has a constitutional right not to testify.
Not every case involves all of these witnesses. The parties' witness lists and the court's rulings determine what evidence is presented.
Do I Have to Testify at My DUI Jury Trial?
No. A criminal defendant has the right not to testify.
The prosecution cannot shift its burden to the defendant by arguing that the defendant had to take the witness stand to prove innocence.
Whether testifying is appropriate is a case-specific strategic decision made after discussing the evidence, potential cross-examination, and the risks and benefits with counsel.
The defendant personally decides whether to testify after receiving legal advice.
Jury Instructions Are the Legal Roadmap
The judge instructs the jury on the law, including the presumption of innocence, reasonable doubt, the elements of the charges, and how to evaluate evidence.
Lawyers may argue about which instructions should be given based on the evidence and the applicable law.
Presumption of Innocence
The defendant begins the trial presumed innocent. A charge is not proof.
Reasonable Doubt
The prosecution must prove every element beyond a reasonable doubt.
Evaluating Witnesses
Jurors consider credibility, perception, memory, consistency, and other relevant factors.
What Happens When the Jury Deliberates?
After receiving the court's instructions, the jurors deliberate privately and attempt to reach a unanimous verdict on each charge.
Not Guilty
An acquittal means the defendant is not convicted of that charge. It does not necessarily decide separate DMV administrative proceedings.
Guilty
A guilty verdict is followed by further proceedings, including sentencing and any applicable post-trial motions.
Hung Jury
If jurors cannot reach a unanimous verdict, the court may declare a mistrial on the unresolved charge. A retrial may be possible.
The jury may reach different verdicts on separate charges. A result on one count does not automatically dictate the result on another count.
What Should You Discuss With Your DUI Attorney?
The Exact Charges
Understand the elements of each count and what the prosecution must prove.
The Evidence
Review police reports, video, chemical-test records, statements, and witness information.
Pretrial Motions
Discuss evidentiary and constitutional issues that may require court rulings before or during trial.
Witnesses and Experts
Identify witnesses who may testify and whether expert analysis is warranted.
Whether to Testify
Discuss the potential benefits and risks, while recognizing that the decision belongs to the defendant.
Possible Outcomes
Understand the potential verdicts, sentencing exposure, and separate DMV consequences.
California DUI Jury Trial FAQs
How many jurors are on a DUI jury?
A California criminal jury generally consists of 12 jurors, including in ordinary misdemeanor DUI trials.
Does the jury have to be unanimous?
Yes. A California criminal jury must reach a unanimous verdict to convict or acquit on a charge.
How long does a DUI jury trial take?
The duration varies depending on jury selection, the number of witnesses, scientific evidence, motions, court scheduling, and deliberations. Ask your attorney for an estimate based on your particular case.
Can I win a DUI trial if my BAC was over 0.08?
A reported result above 0.08 does not eliminate the prosecution's burden. The evidence, testing process, timing, applicable presumptions, and other facts must be evaluated. No result can be guaranteed.
Do I have to testify?
No. The defendant has a constitutional right not to testify. Whether to testify is a personal decision made after consultation with counsel.
What happens if the jury cannot agree?
The court may declare a mistrial on the unresolved charge. The prosecution may be able to retry that charge, subject to applicable law.
Does a not-guilty verdict automatically restore my license?
Not necessarily. California DMV administrative proceedings can be separate from the criminal case. The effect of an acquittal depends on the applicable DMV issues and law.
Is Your Orange County DUI Case Heading Toward Trial?
A trial decision should be made with a clear understanding of the charges, evidence, potential defenses, and possible consequences.
I represent clients facing DUI charges in Orange County and can review the evidence and procedural status of your case with you.
Law Office of Hieu Vu · Tustin, California. Hieu N. Vu · California State Bar No. 265669. General information only. Reading this page does not create an attorney-client relationship.
More Orange County DUI Resources
About the Law Office of Hieu Vu
Hieu Vu is a California criminal defense attorney based in Tustin, representing clients in Orange County criminal courts.
