Understanding your constitutional rights during a traffic stop is crucial. From the moment you see flashing lights in your mirror, every action you take can affect the outcome of your case. This guide covers what officers can and cannot do, and how to protect yourself legally.
Your Right to Remain Silent
Under the Fifth Amendment to the U.S. Constitution, you have the right to remain silent during a traffic stop. You are required to provide your driver's license, vehicle registration, and proof of insurance when requested by the officer. Beyond that, you are not required to answer questions about where you are coming from, where you are going, whether you have been drinking, or any other potentially incriminating questions.
You can politely say: "Officer, I respectfully decline to answer any questions and I would like to speak with an attorney." This is not an admission of guilt — it is the exercise of your constitutional rights. Anything you say to the officer can and will be used against you in both your criminal case and your DMV hearing.
Field Sobriety Tests Are Optional
In California, roadside field sobriety tests (FSTs) — such as walking in a straight line, standing on one leg, or the horizontal gaze nystagmus test — are entirely voluntary. You have the right to politely decline these tests without penalty to your driver's license. Unlike chemical tests (breath or blood), which carry consequences for refusal under California's implied consent law, field sobriety tests are not covered by implied consent and you cannot be penalized for declining them.
FSTs are subjective and designed to be failed. Even sober people can struggle with balance, coordination, and following complex instructions under the stress and conditions of a roadside stop. Politely declining FSTs is often the legally safest choice.
The Difference Between Preliminary and Evidentiary Breath Tests
Understanding this distinction is critical. A Preliminary Alcohol Screening (PAS) test — the handheld breath device at the roadside — is generally optional for drivers over 21 who are not on DUI probation, unless you have already been lawfully arrested. You can decline the PAS test without triggering the enhanced penalties that apply to refusing a post-arrest chemical test.
However, once you are lawfully arrested, California's implied consent law requires you to submit to a chemical test (breath or blood at the police station). Refusing the post-arrest chemical test results in a mandatory 1-year license suspension for a first offense, 2-year revocation for a second offense within 10 years, and 3-year revocation for a third offense. This suspension is in addition to any suspension from the DUI itself.