How do I challenge a field sobriety test in Minnesota?

If you’ve been pulled over in Minnesota and asked to perform a field sobriety test, you’re not alone. Field sobriety tests are commonly used by law enforcement officers to establish probable cause for a DWI arrest. But these tests aren’t foolproof, and the results can be challenged, sometimes successfully.

If you believe you were unfairly charged after a flawed field sobriety test, understanding your legal rights is the first step toward building a defense. Let’s walk through how these tests work in Minnesota, why they can be unreliable, and what legal strategies are available to fight back.

What Is a Field Sobriety Test?

Field sobriety tests (FSTs) are physical coordination exercises used by police officers during a traffic stop to help assess whether a driver is impaired.

The three standardized tests endorsed by the National Highway Traffic Safety Administration (NHTSA) are:

1. Horizontal Gaze Nystagmus (HGN) Test: Measures involuntary eye movements.
2. Walk-and-Turn Test: Assesses performance during instructed heel-to-toe steps and a specified turn.
3. One-Leg Stand Test: Involves standing on one leg for 30 seconds.

These are standardized observations, not a diagnosis or an automatic finding of guilt. Administration, scoring, and the driver’s circumstances can be examined alongside the other evidence.

Are Field Sobriety Tests Mandatory in Minnesota?

Physical coordination exercises are different from breath screening and evidentiary chemical testing. Do not assume that every roadside test has the same refusal rules. Tell the officer about a physical limitation and comply with lawful safety directions. An attorney can evaluate what test was requested and the consequences in your circumstances.

Separate statutory requirements govern chemical testing (including breath, blood, or urine testing). A lawful arrest is not the only statutory condition for requesting an evidentiary test. Depending on the test and applicable requirements, refusal can have criminal as well as licensing consequences.

If you’re unsure about your rights at a traffic stop, Martine Law can help you understand what actions may or may not help your case.

Factors to Review in Field Sobriety Testing

An attorney can compare the testing instructions and observations with the actual conditions. Potential issues to investigate include:

1. Medical Conditions and Physical Limitations

• Back problems, joint injuries, balance disorders, or neurological issues can cause a sober person to fail coordination-based tests.
• Older adults or individuals with disabilities may be unfairly penalized.

2. Environmental Factors

• Uneven pavement, poor lighting, bad weather, or noisy surroundings can affect test results.
• Wearing heels or loose-fitting clothes could also affect performance.

3. Officer Bias or Improper Training

• Officers may not properly administer the tests according to NHTSA guidelines.
• Their observations are subjective and can be influenced by confirmation bias.

4. Nervousness or Anxiety

• Being pulled over by police is stressful. Even sober drivers may fumble under pressure.

How to Challenge a Field Sobriety Test in Court

If you’ve been arrested based on the results of a field sobriety test, you and your attorney can challenge that evidence using several legal strategies.

1. Question the Officer’s Training and Procedure

Ask:

• Was the officer properly trained in FST protocols?
• Did they follow the correct steps during the stop?
• Did they provide proper instructions or mislead the driver?

Errors in procedure can cast doubt on the entire test.

2. Point Out Physical or Medical Conditions

If you have a medical condition or physical limitation that could have affected your performance, your attorney can present medical records or expert testimony.

The significance of a documented limitation depends on the test, the evidence, and the issues before the court; it does not automatically establish a defense.

3. Use Dashcam or Bodycam Footage

Footage from the scene may show that:

• The testing area was unsafe or uneven
• You followed instructions reasonably
• The officer exaggerated your behavior in the report

Such video evidence can be powerful in court.

4. Hire a Forensic or Field Sobriety Test Expert

Experts can testify about the unreliability of field sobriety tests and explain to the court how environmental or physical factors may have played a role in your performance.

5. Challenge Probable Cause for Arrest

If the field sobriety test was the main factor that led to your arrest, and it was administered improperly or on shaky grounds, your attorney may be able to challenge the probable cause that justified your arrest in the first place.

Can Failing a Field Sobriety Test Lead to Conviction?

Poor performance does not automatically establish guilt. The prosecution must prove the charged offense beyond a reasonable doubt. Do not assume that a chemical result is required for every impaired-driving charge. Depending on the charge and admissibility rules, the evidence may include:

• Breathalyzer or blood test results
• Officer’s written report
• Driving behavior (e.g., swerving)
• Witness statements

A successful challenge may affect how evidence is weighed or whether particular evidence is admitted. It does not guarantee dismissal; the court must consider the applicable law and remaining admissible evidence.

What About Portable Breath Tests (PBTs)?

Minnesota law allows officers to request a Preliminary Breath Test when the requirements of section 169A.41 are met. Preliminary screening is distinct from evidentiary chemical testing. Section 169A.41 generally limits court use of screening results, with listed exceptions, while allowing their use in deciding whether to arrest and require further testing.

An attorney can review whether the device was approved, how it was used, and whether a proposed use of the result fits a statutory exception. A claimed device problem does not automatically exclude all evidence.

What If I Already Took and “Failed” the Test?

Even if you performed the test and the officer claimed you failed, you still have options. At Martine Law, we regularly help clients fight back against questionable DWI arrests by:

• Reviewing bodycam footage
• Investigating officer training and credentials
• Consulting medical experts
• Negotiating with prosecutors for reduced charges or dismissal

Don’t assume that just because you took the test and were arrested, you are automatically guilty. The available defenses and possible outcomes depend on the facts and law; no reduction or dismissal is guaranteed.

Why You Need a DWI Attorney

DWI charges are serious. A conviction can lead to:

• Loss of driving privileges
• Fines and fees
• Increased insurance rates
• Possible jail time
• A criminal record; any eligibility for later sealing requires separate review

When your freedom and future are on the line, don’t try to navigate the legal system alone. A qualified DWI defense attorney can help you understand your rights, challenge questionable evidence, and present the strongest case possible.

Contact Martine Law for DWI Defense in Minnesota

Were you arrested after a field sobriety test in Minnesota? We understand how overwhelming the situation can be. At Martine Law, we are committed to defending your rights and fighting unjust charges.

Request a consultation, and let us help you challenge the evidence and protect your future.

Helpful Resources:

• Minnesota Judicial Branch – DWI and Implied Consent
• NHTSA – Highway Safety Resources
• LawHelpMN – General Legal Resources

Preparing for Review of a Minnesota Field Sobriety Test

What should I preserve?

Keep the citation, release papers, license notices, and a factual timeline. Note the location, surface, lighting, footwear, instructions, and any limitation you reported. Preserve existing recordings without editing them. An attorney can seek relevant police recordings and evaluate whether medical records or an expert would help.

Does a challenge to the exercises resolve my license case?

No automatic result follows. Criminal charges and administrative license issues can involve separate procedures and deadlines. Have an attorney review every notice promptly.

Who assists with the initial request?

A Director of Client Engagement (non-attorney) may help with intake and scheduling. This role does not provide legal advice. An attorney evaluates testing evidence, defenses, and deadlines.

Primary resources: Minnesota preliminary screening statute, chemical testing requirements, impaired-driving offenses, and NHTSA standardized field sobriety testing resources.