
Being pulled over on suspicion of driving under the influence can be an overwhelming and stressful experience. Many drivers are unsure of their legal rights during a DUI investigation, particularly when police officers begin requesting roadside tests or asking questions about alcohol consumption. Understanding the difference between voluntary field sobriety tests and mandatory chemical testing after an arrest is important for anyone driving in California. If you’ve been accused of a DUI in California, it is crucial to contact a criminal defense attorney as soon as possible.
About DUI Charges in California
Driving under the influence (DUI) is one of the most commonly charged criminal offenses in California. A DUI occurs when a person operates a motor vehicle while impaired by alcohol, illegal drugs, prescription medications, or even certain over-the-counter medications that affect the ability to drive safely. California takes DUI offenses very seriously, and even a first-time conviction can carry significant consequences.
Potential penalties for a DUI in California may include fines, probation, mandatory DUI education programs, suspension or revocation of a driver’s license, increased insurance costs, and possible jail time. In more serious cases involving injuries, repeat offenses, or extremely high blood alcohol levels, the penalties can become substantially harsher. As the consequences are serious, it is important for drivers to understand their rights during a DUI investigation and always consult a DUI attorney.
The DUI Field Sobriety Tests in California
When an officer suspects a driver may be impaired, the officer must first establish probable cause in order to make a legitimate DUI arrest. To help determine whether impairment exists, officers often request that the driver complete a series of field sobriety tests designed to evaluate balance, coordination, attention, and eye movement.
The commonly used field sobriety tests include:
• The Horizontal Gaze Nystagmus Test, where an officer asks the driver to follow an object with their eyes while observing for involuntary eye movements.
• The Walk-and-Turn Test, which requires the driver to walk heel-to-toe in a straight line and follow instructions carefully.
• The One-Leg Stand Test, where the driver must balance on one leg while counting aloud.
These tests are intended to help officers assess whether alcohol or drugs may be impairing the driver. However, field sobriety tests are not always reliable. Medical conditions, anxiety, fatigue, poor weather conditions, uneven pavement, age, injuries, or even nervousness during a traffic stop can affect driving performance.
Can You Refuse a Field Sobriety Test in California?
One of the most common questions drivers ask is whether they can refuse a field sobriety test during a traffic stop in California. The answer is yes; individuals have the right to refuse these tests and are protected from self-incrimination. Field sobriety tests are typically voluntary for adults who are not on DUI probation and who are over the age of 21.
Drivers are also not required to answer potentially incriminating questions about alcohol consumption or drug use. However, refusing field sobriety tests does not necessarily prevent an arrest. Officers may still rely on other observations, such as driving behavior, the smell of alcohol, slurred speech, bloodshot eyes, or admissions made by the driver. However, prosecutors could bring up a refusal in court by arguing that the driver refused testing because they knew they would fail. While refusing a field sobriety test is not itself a crime in most situations, it is important to know that refusing a field sobriety test may still be presented as evidence in court.
Refusing a DUI Chemical Test in California

It is also important to understand the difference between field sobriety tests and chemical testing. Once a driver is lawfully arrested for DUI in California, the state’s implied consent laws generally require the driver to submit to an official chemical test, such as a breath or blood test. Chemical tests are much more reliable to determine intoxication. Refusing a post-arrest chemical test can result in serious consequences, including an automatic 1-year suspension of your California’s driver’s license, enhanced penalties, and additional complications in court.
Contact The Law Office of Nicolai Cocis For Experienced DUI Defense
If you or a loved one has been arrested for DUI, contact The Law Office of Nicolai Cocis for experienced and dedicated DUI defense representation in Riverside County and the surrounding areas. Our passionate legal team understands the serious nature of DUI charges and is committed to protecting clients’ rights and driving privileges. Prompt legal guidance can make a substantial difference in the outcome of your case, so do not wait to discuss your options with a qualified DUI defense attorney. Contact us today to schedule a consultation.



