If you are stopped for a DUI, pull over safely, keep your hands visible, hand over your license, registration, and insurance, and then say as little as possible. You are required to identify yourself and produce your documents, but you are not required to answer questions about where you’ve been or what you’ve had to drink, you can decline a vehicle search, and in most states you can decline roadside field sobriety tests and the handheld preliminary breath test without automatic penalties. The one test that carries real consequences for refusing is the chemical test after you’ve been formally arrested, because every state has an implied consent law tied to your driver’s license.1National Highway Traffic Safety Administration. Lower BAC Limits
The First Minute After the Lights Come On
Signal and pull to the right as soon as it’s safe. Turn off the engine. If it’s dark, switch on the dome light. Put both hands on the steering wheel where the officer can see them.
Officers document the stop from the moment they activate their lights. How long you took to pull over, whether you swerved while doing it, and whether you fumbled with anything inside the car all go into the report and can show up later as evidence of impairment. Small, visible gestures of cooperation shape the officer’s initial read of the encounter.
Stay in the vehicle unless the officer tells you to get out. Stepping out on your own raises the tension of the stop and gives the officer a reason to suspect something is wrong.
What You Must Hand Over
You are legally required to provide your driver’s license, vehicle registration, and proof of insurance. Have them ready, or tell the officer where they are before you reach for anything. That’s the full list of what the law compels you to produce at a traffic stop.
What You Don’t Have to Answer
After checking your documents, the officer will start asking questions designed to build a case. “Have you had anything to drink tonight?” “Where are you coming from?” “How much did you have?” These are not casual conversation. Every answer gets documented, often verbatim, and gets repeated in court.
The Fifth Amendment protects you from being compelled to incriminate yourself.2Congress.gov. U.S. Constitution – Fifth Amendment You have to give your name and your documents. You do not have to answer investigative questions. A polite “I respectfully decline to answer questions” is enough.
Admitting to even one drink gives the officer a factual basis to escalate the investigation. Lying creates a separate set of problems. Silence is almost always the better option.
Passengers have rights too. They are generally not required to answer questions about where you’ve been or what you’ve consumed, and they can ask the officer whether they are free to leave.
If the Officer Asks to Search Your Car
You are not required to consent to a vehicle search, and declining one is not evidence of guilt. The Fourth Amendment protects against unreasonable searches, and a traffic stop by itself does not give police blanket authority to go through your car.3Legal Information Institute. Fourth Amendment
Officers can search without your consent in specific situations. If they see contraband or open containers in plain view, that’s probable cause. If they reasonably believe a weapon poses a safety threat, they can conduct a limited search. If they arrest you, they can search the passenger compartment, but only if you could still access it at the time of the search or if they reasonably believe it contains evidence of the crime of arrest. In Arizona v. Gant, the Supreme Court held that once an arrestee is handcuffed and secured in a patrol car, officers generally cannot go back and search the vehicle under the search-incident-to-arrest theory alone.4Justia. Arizona v. Gant, 556 U.S. 332 (2009)
If you want to decline, say it clearly: “I do not consent to a search of my vehicle.” The officer may search anyway if they believe they have legal grounds, but your verbal refusal preserves the issue so your attorney can challenge the search later.
Field Sobriety Tests Are Voluntary
If the officer suspects impairment, you’ll be asked to step out and perform field sobriety tests. The National Highway Traffic Safety Administration has validated three: the Horizontal Gaze Nystagmus test, where the officer tracks your eye movement; the walk-and-turn, where you take nine heel-to-toe steps along a line and turn; and the one-leg stand, where you balance on one foot for about 30 seconds.5National Highway Traffic Safety Administration. DWI Detection and Standardized Field Sobriety Testing Refresher Instructor Guide
These tests are less reliable than most people assume. NHTSA’s own research puts the Horizontal Gaze Nystagmus test’s accuracy at about 88%, the walk-and-turn at about 79%, and the one-leg stand at about 83%.5National Highway Traffic Safety Administration. DWI Detection and Standardized Field Sobriety Testing Refresher Instructor Guide A sober person fails roughly one in five times on some of them. Fatigue, uneven pavement, medical conditions, footwear, nerves, and age all affect performance. The officer scores you, and that scoring is subjective.
In most states, field sobriety tests are voluntary. You can politely refuse: “I’d prefer not to perform the tests.” The officer may weigh your refusal when deciding whether to arrest you, but refusing prevents them from collecting the subjective evidence these tests produce. There is no automatic license suspension for declining roadside field tests. That penalty applies only to chemical tests after an arrest.
The Two Breath Tests Are Not the Same
This distinction trips up more people than almost anything else during a DUI stop. There are two completely different breath tests, and the rules for each are different.
The Roadside Portable Breath Test
Before an arrest, the officer may offer you a portable breath test, often called a PBT. This is a handheld device used at the roadside, and in most states the results are not admissible as evidence at trial. The PBT helps the officer decide whether to arrest you. In most jurisdictions you can refuse it without triggering automatic penalties like a license suspension.
The Post-Arrest Chemical Test
Once you are formally arrested, the rules change. Every state has an implied consent law: by holding a driver’s license, you have already agreed to submit to a chemical test of your breath, blood, or urine if you are lawfully arrested for impaired driving. Refusing this test triggers consequences separate from, and often harsher than, the criminal case itself.
For a first refusal, the most common penalty is an automatic license suspension of six months to one year, with some states imposing longer suspensions for repeat refusals or prior offenses. In a growing number of states, a second or third refusal is a criminal offense on its own, carrying fines and possible jail time. The refusal can also be introduced at trial, where prosecutors will argue it shows consciousness of guilt.
Whether to refuse or submit is a genuinely hard call. Submitting gives prosecutors a BAC number to use against you. Refusing avoids that number but triggers administrative penalties and lets the prosecution tell a jury you wouldn’t take the test. This is one of the most consequential decisions of the entire encounter, and it happens when you are least equipped to think clearly. If you have any opportunity to speak with an attorney before deciding, take it. Some states provide that right.
If You Are Arrested
If the officer determines they have probable cause, you’ll be placed under arrest, handcuffed, and put in the back of a patrol car. Before any further interrogation, you should receive Miranda warnings: the right to remain silent, the right to an attorney, and the warning that anything you say can be used against you.6Constitution Annotated. Miranda Requirements
One nuance catches people off guard. Miranda applies to custodial interrogation, not to the traffic stop itself. The questions the officer asked on the roadside before the arrest did not require Miranda warnings, because you were not yet in custody. That’s exactly why those pre-arrest answers are so damaging, and why declining to answer them matters.
Once Miranda warnings are given, invoke your rights clearly. Say “I am invoking my right to remain silent” and “I want to speak with an attorney.” Then stop talking. Don’t explain, don’t apologize, don’t try to talk your way out of it. Anything you say after this point, including casual remarks to other officers or comments in the holding cell, can end up in the prosecution’s case file.
You’ll be transported to a police station or county jail for booking: photograph, fingerprints, personal information. Your vehicle will typically be towed and impounded. Most first-time DUI arrestees are released within several hours on bail or on their own recognizance with a citation to appear in court.
Request an Administrative License Hearing Within Days
This is where people make one of the most costly mistakes in the entire process. A DUI arrest triggers two parallel proceedings: the criminal case in court, and a separate administrative action against your driver’s license. The administrative action moves on its own timeline and does not wait for the criminal case to resolve.
If you refused or failed a chemical test, your license suspension begins automatically unless you request an administrative hearing within a short deadline, often as few as 7 to 30 days after arrest, depending on the state. Miss that window and the suspension takes effect by default, even if you are ultimately acquitted of the criminal charge.
The administrative hearing is your chance to challenge whether the officer had valid grounds for the arrest, whether the chemical test was administered properly, and whether the implied consent process was correctly followed. The outcome of the administrative hearing has no effect on the criminal case, and vice versa. You need to fight both separately.
Contact a DUI defense attorney within the first day or two after arrest, specifically because this deadline is so short. Many people focus on the court date weeks away and completely miss the administrative clock already running.
Why a Failed Breath Test Isn’t the End
A BAC reading above the legal limit feels decisive, but these tests are not infallible. Breath testing devices require regular calibration, and missed or incomplete maintenance records can be grounds for suppressing the result. Most states also require an observation period before the test, typically 15 minutes, to make sure residual mouth alcohol from a recent drink, burp, or medical condition doesn’t inflate the reading. If the officer skipped or shortened that observation period, the result is open to challenge.
Medical conditions create another category of problems. Acid reflux and GERD push stomach contents into the esophagus, introducing alcohol vapor the device reads alongside what’s coming from your lungs. Diabetes and ketogenic diets elevate acetone levels in the breath, which some devices misidentify as ethanol. Certain asthma inhalers contain compounds that can produce dramatically false readings. Even recent exposure to paint fumes or cleaning solvents has been shown to affect results.
None of this guarantees dismissal, but the number on the printout is not necessarily the number in your blood. A defense attorney who understands the science can request calibration records, maintenance logs, and officer training certifications, then challenge the results when the paperwork doesn’t hold up.
Sobriety Checkpoints Work the Same Way
Everything above applies whether you’re pulled over individually or stopped at a sobriety checkpoint. The Supreme Court upheld the constitutionality of DUI checkpoints in Michigan Department of State Police v. Sitz, finding that the brief intrusion on individual liberty was outweighed by the government’s interest in reducing drunk driving.7Office of Justice Programs. Sobriety Checkpoints: Constitutional Considerations Roughly a dozen states prohibit or effectively don’t use checkpoints under their own state constitutions.
At a checkpoint, the initial detention is supposed to be brief. Officers look for obvious signs of impairment: the smell of alcohol, slurred speech, open containers. If they don’t observe anything, you should be waved through. If they do, the encounter escalates into a standard DUI investigation, with the same decision points: provide your license and registration, decline investigative questions if you choose, understand that field sobriety tests are voluntary, and know that post-arrest chemical tests carry implied consent penalties.