What Happens If You Refuse a Field Sobriety Test?
Being pulled over by law enforcement late at night on suspicion of driving under the influence (DUI/DWI) is an intimidating ordeal that prompts many drivers to ask: what happens if you refuse a field sobriety test? There is widespread public confusion surrounding the legal distinction between roadside physical coordination tests and official post-arrest chemical tests. Standardized Field Sobriety Tests (SFSTs)—including the Horizontal Gaze Nystagmus eye test, the Walk-and-Turn heel-to-toe exercise, and the One-Leg Stand balance test—are 100 percent voluntary in virtually every state, carrying zero automatic driver's license suspensions for polite refusal. However, confusing voluntary roadside acrobatics with mandatory post-arrest chemical breath or blood tests governed by state Implied Consent Laws can lead to severe legal penalties. Understanding your legal rights and consequences protects your driver's license and legal defense.
Voluntary Roadside Tests vs Mandatory Implied Consent Chemical Tests
The critical legal distinction every motorist must understand is the difference between preliminary roadside agility tests and post-arrest chemical testing. Standardized Field Sobriety Tests (SFSTs) administered on the shoulder of the highway are purely voluntary investigative tools. Police officers use these subjective physical exercises to manufacture probable cause for an arrest; performing them gives the prosecution video evidence of your minor balance slips.
In sharp contrast, once an officer places you under formal arrest and transports you to the police station or hospital, state Implied Consent Laws take effect. By holding a valid state driver's license and operating a vehicle on public roads, you have legally consented to submit to an evidentiary chemical test (an evidentiary station breathalyzer, blood draw, or urine test). Refusing this post-arrest chemical test carries severe administrative penalties, including automatic driver's license revocation for one year.
The table below compares voluntary roadside field sobriety tests against post-arrest implied consent chemical tests.
| Testing Category | Test Types Included | Legal Requirement Status | Direct Legal Penalty for Refusal |
|---|---|---|---|
| Standardized Field Tests (SFST) | Horizontal Gaze Nystagmus, Walk & Turn, One-Leg Stand | 100% Voluntary in almost all states | ZERO automatic license suspension; police may still arrest |
| Preliminary Breath Test (PBT) | Handheld roadside breath screening device | Voluntary in most states (Small fine in few) | Not an evidentiary test; refusal cannot suspend license |
| Post-Arrest Evidentiary Breath | Intoxilyzer 8000 / Datamaster station machine | MANDATORY under Implied Consent | Immediate 1-year license revocation; refusal admitted in court |
| Post-Arrest Blood Draw | Hospital venous blood vial draw | MANDATORY (Police can obtain warrant) | Immediate license suspension; forced draw with judge warrant |
Politely declining voluntary roadside tests prevents officers from collecting subjective balance evidence against you.
How Officers Establish Probable Cause and the Risk of Arrest
A common misconception is that refusing voluntary field sobriety tests guarantees that police cannot arrest you. In reality, officers do not need field sobriety test results to effect an arrest. If an officer observes swerving or lane drift, smells alcohol on your breath, notices bloodshot glassy eyes, or observes slurred speech, they already possess sufficient circumstantial evidence to arrest you for DUI.
However, by politely declining the roadside tests, you deny the prosecution their most powerful courtroom weapon: cruiser dashcam video showing you stumbling along a painted white line or failing to count backward. Refusing roadside tests forces the prosecution's case to rely entirely on subjective officer testimony rather than embarrassing physical performance footage.
The table below reviews the three standardized NHTSA field sobriety tests, their error rates, and subjective scoring flaws.
| NHTSA Standardized Test | Physical Exercise Task | Documented Inaccuracy Flaw | Subjective Officer Clues Scored |
|---|---|---|---|
| Horizontal Gaze Nystagmus (HGN) | Tracking a pen or light with eyes horizontally | Triggered by caffeine, fatigue, or natural eye jerking | Officer checks for smooth pursuit and nystagmus angle |
| Walk-and-Turn (WAT) | 9 heel-to-toe steps down line, turn, 9 steps back | Failed easily by people over 65, overweight, or in heels | Cannot keep balance, stops walking, misses heel-to-toe |
| One-Leg Stand (OLS) | Hold one foot 6 inches off ground and count aloud | Inner ear infections, wind, or knee arthritis cause failure | Sways while balancing, uses arms to balance, hops, puts foot down |
These physical tests are notoriously subjective and are frequently failed even by completely sober drivers.
How to Respond Legally During a Traffic Stop and Sobriety Request in 4 Steps
Follow this calm, legally sound procedure if an officer asks you to step out of your vehicle for sobriety testing.
Step 1: Pull Over Safely and Present License and Registration
Signal, pull over safely onto the right shoulder, turn on your interior dome light, and hand your driver's license and registration calmly to the officer.
Step 2: Comply with the Lawful Order to Step Out of the Vehicle
If the officer orders you out of the car, you must comply under Pennsylvania v. Mimms; step out smoothly without leaning heavily on the door frame.
Step 3: Politely Decline Voluntary Roadside Physical Tests
State clearly and respectfully: 'Officer, with all due respect, I am politely declining to perform any voluntary field sobriety or roadside balance tests.'
Step 4: Request to Speak with a Criminal Defense Attorney
If placed under arrest, state that you wish to invoke your right to remain silent and want to speak with an attorney before answering any questions.
Frequently Asked Questions (8 Questions Answered)
Q1: Can you legally refuse a field sobriety test?
Yes. In virtually every U.S. state, roadside Standardized Field Sobriety Tests (walking a line, standing on one leg, eye tests) are 100 percent voluntary and can be declined.
Q2: Will you get arrested if you refuse field sobriety tests?
Yes, it is very likely. If an officer suspected you enough to ask for tests, they will likely arrest you based on observed driving, odor of alcohol, or slurred speech.
Q3: What is the difference between a PBT and the station breathalyzer?
A PBT is a handheld roadside screening gadget whose results are often inadmissible in court. The station breathalyzer (Intoxilyzer) is an official evidentiary machine covered by implied consent laws.
Q4: What happens if you refuse the breathalyzer at the police station?
Refusing the post-arrest station chemical test triggers immediate administrative driver's license suspension (typically 1 year) under state Implied Consent laws, regardless of whether you are convicted.
Q5: Can police force you to take a blood test if you refuse?
Yes. If you refuse chemical testing, police can electronically contact an on-call judge to obtain an emergency search warrant authorizing a mandatory hospital blood draw.
Q6: Does refusing field sobriety tests make you look guilty to a jury?
In many states, the prosecution cannot even mention that you declined voluntary roadside tests. Where permitted, defense attorneys explain that sober people routinely decline unreliable tests.
Q7: Can medical conditions cause you to fail field sobriety tests?
Yes. Neurological disorders, inner ear infections (vertigo), arthritis, prior knee injuries, obesity, and nervousness can all cause sober individuals to fail balance tests.
Q8: Should I blow into the roadside handheld breathalyzer?
Most criminal defense attorneys advise politely refusing roadside handheld breathalyzers (PBTs) unless state law imposes a specific traffic fine, as they only aid the officer in arresting you.
Final Thoughts & Key Takeaways
In conclusion, understanding what happens if you refuse a field sobriety test? provides essential clarity, practical strategies, and actionable advice. By incorporating these foundational insights, adhering to verified safety guidelines, and following structured best practices, you ensure reliable, long-term outcomes while preventing common mistakes. Stay informed, consult certified professionals when needed, and maintain consistent quality care.