What Happens If You Refuse a Breathalyzer in San Diego?

Getting pulled over for a suspected DUI is stressful. Maybe you’re driving on I-5, heading home from dinner in the Gaslamp Quarter, when flashing red and blue lights appear behind you. The officer asks a few questions, then holds up a handheld breathalyzer.

At that moment, most drivers ask the same questions: Do I have to take this test? What happens if I refuse? Will refusing help or hurt my case?

In San Diego—and throughout California—the answer depends on which breath test you are being asked to take. Refusing a breathalyzer can have very different consequences depending on the timing.

1. The Roadside Breath Test (PAS Test)

Before an arrest is made, an officer may ask you to take a Preliminary Alcohol Screening (PAS) test. This is the handheld breathalyzer used during a traffic stop or DUI checkpoint.

Can you refuse?
Yes, in most cases. If you are over 21 and not on DUI probation, you generally have the right to decline the PAS test without immediate penalties.

What actually happens:
Even if you refuse the roadside breathalyzer, the officer can still arrest you based on other observations—such as slurred speech, the odor of alcohol, or how you perform on field sobriety tests. Refusing the PAS does not automatically prevent a DUI arrest.

2. The Post-Arrest Breath or Blood Test (Implied Consent)

Once you are formally arrested for DUI, the situation changes completely.

Under California’s Implied Consent Law, every licensed driver has already agreed to submit to a chemical test—either breath or blood—after a lawful DUI arrest.

Refusing this post-arrest test in San Diego triggers serious consequences:

Automatic License Suspension:
The DMV will suspend your license for one full year for a first refusal. Unlike many DUI cases, restricted licenses are usually not available.
Harsher Criminal Penalties:
If you are later convicted, the refusal acts as an enhancement. This often means additional jail time and a longer DUI education program.
Used Against You in Court:
Prosecutors may argue that refusal shows “consciousness of guilt,” telling a jury you refused because you believed you would fail.

The 10-Day Deadline That Can Cost You Your License

After a DUI arrest in San Diego, officers typically confiscate your physical license and issue a temporary pink license valid for 30 days.

You have only 10 days from the date of arrest to request a DMV administrative hearing. If you miss this deadline, your license suspension goes into effect automatically—regardless of what happens in court.

Why a San Diego DUI Refusal Case Needs a Strategic Defense

Refusing a breathalyzer doesn’t end a DUI case—it changes how it’s fought.

An experienced defense focuses on procedural issues, such as:

Whether the officer properly explained refusal consequences
Whether the arrest itself was lawful
Whether the traffic stop violated your rights

DUI refusal cases are fought on two fronts: San Diego Superior Court and the DMV. Winning or losing often comes down to timing, procedure, and local experience.

Facing a DUI Breathalyzer Refusal in San Diego?

DUI refusal penalties are intentionally severe, but defenses may still exist. If your license is at risk or you’ve been arrested, acting quickly is critical.

For more information about defending DUI and breathalyzer refusal cases in San Diego, consider contacting a local criminal defense law office with experience handling DMV hearings and DUI litigation.

👉 Learn more by contacting the Law Office of Jason Ronis, a San Diego criminal defense firm that regularly handles DUI and breathalyzer refusal cases.