8 Signs a Minnesota DWI Case Is Weak

If you have been charged with a DWI in Minnesota, the case can feel hopeless, especially when the police report reads like an open-and-shut conviction. But a charge is not a conviction, and many DWI cases contain flaws that a defense attorney can use to suppress evidence, reduce the charge, or get it dismissed. Here are the signs to look for.

How can a DWI case be weak in Minnesota?

A DWI case is built in stages: the stop, the investigation, the arrest, and the chemical test. Each stage has to be legally justified on its own. Minnesota case law establishes that every escalation during a stop must be independently justified, and if any step lacks legal grounds, the evidence gathered afterward may be suppressed.

That stacking structure is what makes DWI cases vulnerable. The prosecution needs every link in the chain to hold. A defense lawyer only needs to break one important link to seriously weaken, or end, the case.

8 signs your Minnesota DWI case may be weak

1. The traffic stop was not justified

Police need reasonable, articulable suspicion of a traffic violation or impaired driving before they can pull you over, and Minnesota does not allow sobriety checkpoints. Some conduct officers rely on does not actually justify a stop; weaving within your own lane, for example, is not a violation on its own. If the stop was unlawful, everything that followed can be thrown out.

2. There was no probable cause to arrest

Before arresting you, an officer needs probable cause to believe you were driving while impaired. Subjective observations like “bloodshot eyes” and “odor of alcohol” look damning on paper but are often thin, especially when the driving itself was fine and the video does not match the report.

3. The field sobriety tests were flawed

The standardized field sobriety tests, the walk-and-turn, one-leg stand, and horizontal gaze nystagmus, must be administered according to NHTSA protocols. Officers frequently deviate by running them on uneven ground, in poor lighting, or without proper instructions. These tests are subjective and voluntary, and NHTSA research shows they can produce false-positive rates as high as 46 percent. Age, weight, injuries, footwear, and medical conditions all affect performance. Learn more in our guide to field sobriety tests in Minnesota.

4. The breath test is unreliable

Minnesota uses the DataMaster DMT for evidentiary breath testing, and those machines must be regularly calibrated and maintained by the BCA. A 2025 statewide calibration problem led to dozens of dismissed cases. The officer also has to conduct a proper observation period before the test to rule out mouth alcohol, and conditions like acid reflux or diabetes can inflate a reading. Our overview of challenging breathalyzer results in Minnesota covers this in depth.

5. A blood or urine test was taken without a warrant

This is one of the strongest defenses available. After Birchfield v. North Dakota and the Minnesota Supreme Court’s decisions in Thompson and Trahan, a blood or urine test may be conducted only with a search warrant or a recognized exception. The natural dissipation of alcohol over time does not, by itself, create an emergency that excuses a warrant. No warrant and no valid exception usually means the result is suppressed.

Chemical test	Warrant required in Minnesota?	Note
Breath (DataMaster DMT)	No (allowed as a search incident to a lawful arrest)	Refusal is a crime, but the result can still be challenged on calibration and procedure
Blood	Yes (warrant or valid exception)	No warrant usually means the result is excluded
Urine	Yes (warrant or valid exception)	No warrant usually means the result is excluded

6. You were denied your right to a lawyer before testing

In Minnesota you have a limited right to consult an attorney before deciding whether to take a chemical test, and courts generally treat 20 to 30 minutes as reasonable. If the officer did not give you a real opportunity to do that, the test result can be challenged. See our guide to implied consent and refusing a breath test.

7. A medical condition or rising blood alcohol skewed the result

Your blood alcohol level when you were driving is what matters, not necessarily what it was an hour later at the station. If your alcohol was still being absorbed, your level at the wheel may have been lower than the test showed. Medical conditions such as GERD, diabetes, and certain diets can also distort breath results, and the machine’s margin of error can put a borderline reading below the legal limit.

8. The video contradicts the police report

Squad and body-camera footage is often the most powerful evidence in the case, and it frequently undercuts the report. If the video shows normal driving, clear speech, and steady balance while the report claims the opposite, that contradiction can sink the officer’s credibility and the prosecution’s case.

What happens when DWI evidence is thrown out?

When a judge suppresses evidence, the prosecution loses the ability to use it. If the suppressed evidence is central, such as the breath or blood result, or the stop itself, the State often cannot prove the case and the charge is dismissed or reduced.

Even when evidence is not fully thrown out, weaknesses give your attorney leverage to negotiate a better outcome, such as a reduction to careless driving. The goal is to attack the case at its weakest stage rather than accept the charge at face value. Our guide on how to beat a DWI in Minnesota goes through these strategies.

Does a weak DWI case mean the charges will be dismissed?

Not automatically. A weak case is an opportunity, not a guarantee. The defenses above only help if they are identified, raised through the right motions, and argued effectively, which is why these outcomes depend heavily on the lawyer handling the case.

It is also why timing matters so much. There are strict deadlines, including just 14 days to challenge the license revocation that comes with most DWI arrests, and evidence like squad video can be lost if it is not requested quickly.

What should you do if you think your DWI case is weak?

Do not assume the case will fall apart on its own, and do not assume it is hopeless either. Write down everything you remember about the stop, the tests, and what the officer said, preserve any documents, and avoid discussing the case. Then have an attorney review exactly where the case can be challenged. For the immediate steps, see what to do after a DWI arrest in Minnesota and our complete guide to Minnesota DWI law.

FAQs

What are the signs a DWI case is weak in Minnesota?

Common signs include an unjustified traffic stop, no probable cause to arrest, improperly administered field sobriety tests, an uncalibrated or improperly observed breath test, a blood or urine test taken without a warrant, denial of the right to counsel before testing, medical or rising-alcohol issues, and video that contradicts the police report.

Can a DWI be dismissed because of a bad traffic stop?

Yes. If the stop lacked reasonable suspicion, the evidence gathered afterward can be suppressed. When that evidence is central to the case, the charge is often dismissed or reduced.

Are field sobriety tests reliable evidence?

Not very. They are subjective, voluntary, and affected by conditions and health, and NHTSA research shows false-positive rates as high as 46 percent when tests are not administered correctly.

Do police need a warrant for a breath test in Minnesota?

No for breath, which is allowed as a search incident to a lawful arrest, but yes for blood and urine. A blood or urine test taken without a warrant or a valid exception is usually suppressed.

How long do I have to act after a DWI arrest?

You have only 14 days from the arrest to request a hearing to challenge your license revocation. Other evidence, like squad video, can also be lost if it is not requested promptly, so contact a lawyer right away.