Yes, you can refuse a field sobriety test in California. Roadside coordination exercises like the walk-and-turn, one-leg stand, and eye-tracking test are voluntary for most drivers, and no statute imposes an automatic penalty for declining them. That doesn’t end the DUI investigation, though. The officer can still arrest you based on other observations, and prosecutors are allowed to bring your refusal up in court. Knowing exactly what you can and cannot decline during a stop is what separates a manageable situation from an avoidable disaster.
What Counts as a Field Sobriety Test
Field sobriety tests (FSTs) are the physical exercises an officer asks you to perform on the side of the road. The National Highway Traffic Safety Administration recognizes three standardized versions:
- The Horizontal Gaze Nystagmus test, where the officer moves a pen or fingertip across your field of vision and watches your eyes for involuntary jerking.
- The Walk-and-Turn, where you take nine heel-to-toe steps, turn a specific way, and walk nine steps back while counting aloud.
- The One-Leg Stand, where you raise one foot about six inches off the ground and count aloud for roughly 30 seconds.
All three are designed to force you to split your attention between a physical task and a mental one.1National Highway Traffic Safety Administration (NHTSA). DWI Detection and Standardized Field Sobriety Test (SFST) Participant Manual These are the exercises you can decline.
Why California Law Lets You Say No
No California statute requires you to perform FSTs. California’s implied consent law, Vehicle Code Section 23612, obligates you to submit to a chemical test of blood or breath after a lawful DUI arrest, but that obligation does not reach the roadside coordination exercises that happen before any arrest.2California Legislative Information. California Vehicle Code 23612 Officers may ask, and the request often sounds like an order (“Step out and do some tests for me”), but there is no license suspension, fine, or criminal enhancement for a polite refusal.
The officer will not usually tell you the tests are optional. That silence is legal. It is also why so many drivers submit without realizing they had a choice.
The Roadside Breath Test Follows a Similar Rule
Officers often carry a handheld Preliminary Alcohol Screening (PAS) device separate from the physical FSTs. For most drivers over 21 who are not on DUI probation, the PAS is a screening tool you can decline before arrest, just like the physical tests. It is not the evidentiary chemical test that implied consent covers.
Two groups cannot refuse the PAS:
- Drivers under 21. California’s zero-tolerance law requires submission when an officer has reasonable cause to believe the driver has any measurable alcohol in their system. Refusal triggers a one-year license suspension.
- Drivers on DUI probation. Vehicle Code Section 23154 deems consent to a PAS test already given when the driver is lawfully detained for a suspected alcohol-related violation, and refusing carries its own suspension.3California Legislative Information. California Vehicle Code 23154
If you are over 21 with no DUI probation, you can decline both the physical exercises and the PAS device before arrest without triggering an automatic penalty.
What Happens After You Refuse
Declining does not shut down the investigation. Expect three things.
The officer keeps observing. How you pulled over, how you handled your license, the smell of your breath, your eyes, your speech — all of it is evidence, whether or not you perform any tests. A refusal reduces the number of data points the officer collects; it does not zero them out.
The officer can still arrest you. Probable cause for a DUI arrest does not require FST results. Erratic driving, the odor of alcohol, and general demeanor can be enough on their own, and many DUI arrests occur without any FST performance.
Your refusal can appear in court. Prosecutors are allowed to argue that you declined because you knew you were impaired, a “consciousness of guilt” theory. It proves nothing on its own, and a defense attorney can point out that sober people refuse on principle or on advice of counsel, but the argument exists and you should know it before deciding.
Chemical Testing After Arrest Is Not Optional
This is the distinction that trips people up, and getting it wrong is expensive. Once you are lawfully arrested for DUI, implied consent applies and you must submit to a chemical test of blood or breath.2California Legislative Information. California Vehicle Code 23612 This is the evidentiary test administered at the station or by a phlebotomist, not the roadside PAS device.
Refusing a post-arrest chemical test triggers administrative penalties from the DMV:
- First refusal: one-year license suspension.
- Second refusal within 10 years: two-year license revocation.
- Third refusal within 10 years: three-year license revocation.
These DMV actions happen independently of the criminal case. You can lose your license even if the DUI charge is later dismissed. If you are convicted of DUI after refusing, Vehicle Code Section 23577 adds enhanced criminal penalties, including mandatory additional jail time the judge cannot waive or stay.4California Legislative Information. California Vehicle Code 23577 Decline the roadside exercises if you choose. Comply with the chemical test after a lawful arrest.
Handling the Stop
Pull over safely. Turn off the engine and keep your hands visible. Provide your driver’s license, registration, and proof of insurance when the officer asks. You are required to identify yourself during a traffic stop.5ACLU of Northern California. Know Your Rights: Police Interactions
Beyond identification, you have the right to remain silent. You do not have to answer questions about where you were, what you drank, or when your last drink was. Politely invoke that right instead of trying to talk your way out. “I only had two beers” has produced more convictions than most drivers realize.
If the officer asks you to perform FSTs, a phrase like “I respectfully decline to take any field sobriety tests” is enough. Stay polite. Do not argue, explain, or lecture. The less you say, the less material the prosecution has.
If you are arrested, comply with the chemical breath or blood test. Then contact a DUI attorney quickly. You have only 10 days from the date of arrest to request a DMV administrative hearing to challenge the license suspension, and missing that window means the suspension takes effect automatically.
Commercial Drivers Should Be Especially Careful
If you hold a commercial driver’s license, refusing an alcohol test carries consequences beyond the ordinary DUI framework. Federal regulations through the FMCSA Drug and Alcohol Clearinghouse treat a refusal to submit to a required alcohol test as a violation recorded in your file that prohibits you from operating a commercial vehicle.6Federal Motor Carrier Safety Administration. Drug and Alcohol Clearinghouse FAQ State licensing agencies downgrade commercial driving privileges until you complete a return-to-duty process, which involves evaluation by a substance abuse professional and follow-up testing. The violation stays in the Clearinghouse for five years or until the return-to-duty process is complete, whichever is later. For a driver whose paycheck depends on a CDL, a single refusal can mean months without work.