I am Joel Brand, and I defend DUI cases across California. This post is for anyone who was arrested for DUI after a collision that the other driver caused. You may feel like the arrest is absurd, and I understand that reaction. But California DUI law treats your sobriety as a completely separate question from who caused the crash. Knowing how those two issues interact, and how to protect yourself on both fronts, is exactly what I want to walk you through here.
The Crash and the DUI Are Two Separate Legal Problems
When police arrive at a collision scene, they investigate two things at once: fault for the accident, and the condition of every driver involved. Even if the other driver ran a red light or rear-ended you, an officer who suspects you were drinking will start a DUI investigation. Your BAC does not become legal simply because someone else hit you. The DUI charge and the civil question of who caused the crash live in completely different legal worlds, and neither one automatically cancels the other.
Why Fault for the Crash Can Still Help Your Defense
Just because the two issues are separate does not mean the crash is irrelevant to your DUI defense. If the collision explains why you failed certain field sobriety tests, that matters. A person who was just T-boned may have an elevated heart rate, shaking hands, glassy eyes, and unsteady balance, all of which can look like intoxication to an officer who is watching rather than listening. Evidence that you were in a traumatic crash seconds before the field tests were administered is the kind of context a good defense attorney will put in front of the jury or the prosecutor. Learn more about how unfair field sobriety test conditions factor into DUI defenses.
Your BAC Reading Still Has to Be Challenged on Its Own Merits
Even in a not-your-fault crash, the chemical test result is what the prosecutor will anchor the case to. If you took a blood test, the timing of that draw matters because of the rising BAC defense. Alcohol absorbs into the bloodstream over time, meaning your BAC at the moment of the crash may have been lower than the number that appears on the lab report. If you took a breath test, mouth alcohol contamination and instrument calibration problems are still legitimate angles to explore. The cause of the accident does not change how the breath machine operates or whether it was properly maintained.
Injury to the Other Driver Changes the Charge Entirely
If the other driver or any passenger was hurt, even though they caused the crash, the prosecution may charge you under Vehicle Code 23153, DUI causing injury. That statute does not require you to have caused the collision. It only requires that you drove under the influence and that, as a result of driving, someone was injured. California courts have interpreted this broadly. A felony DUI causing injury conviction carries far heavier consequences than a standard misdemeanor DUI, so if injuries are involved you need to treat this with serious urgency from day one.
The Other Driver's Fault Does Not Protect Your License at the DMV
Most people focus on the criminal case after an arrest, but the DMV suspension runs on its own track. Within ten days of your arrest you must request a DMV hearing or your license will be automatically suspended. The DMV does not care who caused the accident. The administrative hearing is only about whether you were driving with a BAC at or above 0.08 percent, or whether you refused a chemical test. The full picture of what is at stake in that parallel proceeding is laid out in the guide to the DMV hearing. Do not let the crash distract you from that ten-day deadline.
Insurance Complications Are Worse in a Collision DUI
When a DUI and a collision happen together, your auto insurance carrier is dealing with both a liability claim and a DUI arrest at the same time. That combination almost always triggers a mid-term policy review. The way insurers treat a DUI arrest before conviction is covered in detail in a separate post, but collision DUIs accelerate that timeline because the claim itself forces the insurer to look at the facts of the incident right away. Documenting your own version of how the crash happened is important for both your criminal case and any insurance dispute.
Witness Statements at the Scene Are Critical Evidence
In a crash the other driver caused, bystander witnesses often saw what happened. Those same witnesses can also describe your behavior and demeanor after the collision. If a witness tells police the other car blew through a stop sign and that you appeared composed and alert immediately after impact, that statement becomes potentially useful evidence in your defense. Your attorney can request all witness statements through the discovery process. Understanding how DUI cases involving collisions are handled will give you a clearer picture of how that evidence is gathered and used.
Common Police Mistakes Are More Frequent After Collisions
Crash scenes are chaotic. Officers are managing traffic, calling for medical help, interviewing multiple drivers, and writing reports all at once. That pressure leads to mistakes. The officer may have failed to conduct field sobriety tests properly, may not have observed you for the required fifteen-minute observation period before a breath test, or may have made errors in the DS-367 form that documents the chemical test process. Errors in that form can actually help your case, and you can read about specific DS-367 mistakes that matter. Also review the most common police mistakes at a DUI stop generally, because many apply just as much when the stop is triggered by a crash as when it is triggered by erratic driving.
Your Right to Remain Silent Still Applied at the Scene
After a collision, there is enormous social pressure to explain yourself. You may have wanted to reassure the other driver, cooperate with officers, or simply appear innocent. Statements made at the scene, such as how many drinks you had or where you were coming from, become part of the police report and part of the prosecutor's case. If you said something at the scene that you now regret, that is not the end of the road, but it is something your attorney needs to know about immediately so it can be addressed in the defense strategy.
Mitigation Still Matters Even When You Did Not Cause the Crash
Whether or not the other driver was at fault, prosecutors weigh the overall picture of who you are when deciding whether to reduce or resolve a charge. Steps like enrolling in a DUI program early, gathering character references, and documenting any treatment you have sought all contribute to a stronger position at the negotiating table. The role that mitigation plays in DUI outcomes is something every defendant should understand as early as possible.
What to Do Right Now
The fact that the other driver caused the crash gives your defense additional angles, but it does not reduce the urgency of acting quickly. You have the DMV ten-day deadline, you may have a court date approaching, and evidence from the scene, including surveillance footage and witness contact information, can disappear fast. Do not wait.
You can get a free written case analysis right here on this page. Call me directly at (888) 271-6644. I answer my own phone, 24/7. You can also read more from the DUI blog for additional guidance on where your case goes from here.