When you are accused of driving while impaired in Minnesota, the evidence can include far more than a breath-test number. Prosecutors may rely on driving conduct, officer observations, body-camera and squad-camera video, field sobriety testing, a preliminary breath test, and evidentiary breath, blood, or urine testing. But a DWI charge is not a conviction. The state still must prove the charged offense beyond a reasonable doubt, and the evidence must have been lawfully obtained and reliably handled.
At Sieben Edmunds Miller, we examine how each piece of evidence was gathered and whether it actually supports the state’s theory. Understanding the evidence used in a DWI in Minnesota can help you understand where issues proving the state’s case may arise.
What Does the State Have to Prove in a Minnesota DWI Case?
Minnesota law makes it a crime to drive, operate, or be in physical control of a motor vehicle while impaired by alcohol, certain drugs or intoxicating substances, cannabis and hemp-derived products, or a combination of substances. It also prohibits driving, operating, or being in physical control of a motor vehicle with an alcohol concentration of 0.08 or more at the time or as measured within two hours. Minnesota Statutes section 169A.20 sets out the different ways the state may attempt to prove a DWI offense.
Police Observations, Video, and the Legality of the Stop
At Sieben Edmunds Miller, we review the basis for the stop or police contact, the length and scope of the encounter, video footage, dispatch information, and officer reports. Police generally need a valid legal reason to stop your vehicle, such as a traffic violation or reasonable suspicion that you are involved in criminal activity. If evidence was obtained through an unconstitutional stop, detention, or search, the defense may ask the court to suppress that evidence. Whether suppression affects some or all of the state’s case depends on the facts and the remaining admissible evidence.
Field Sobriety Tests and Roadside Evidence
Officers commonly use three Standardized Field Sobriety Tests (SFSTs): the Horizontal Gaze Nystagmus, Walk-and-Turn, and One-Leg Stand. Conditions can affect performance and the weight given to an officer’s observations.
Minnesota officers may also use a preliminary breath test (PBT) at the roadside when authorized by law. A PBT is primarily a screening tool used to help determine whether an arrest should be made and whether further chemical testing should be required. Its use in court is limited by Minnesota Statutes section 169A.41, so it should not be treated as interchangeable with the evidentiary breath test typically administered after arrest.
Breath Test Evidence in Minnesota DWI Cases
For alcohol-related cases, the state may rely on an evidentiary breath test. Minnesota uses the DataMaster DMT for evidentiary breath testing. A meaningful review goes beyond the final alcohol-concentration number and can include the test record, instrument records, operator procedures, and events that occurred before and during the test.
Minnesota Bureau of Criminal Apprehension training materials instruct that a test subject should be observed for at least 15 minutes before a DMT breath test so the observer can detect alcohol being introduced or reintroduced into the mouth, including through belching, regurgitation, or reflux. If the required procedure was not followed, or the test record identifies an issue, that may become part of a challenge to the reliability or admissibility of the result.
Blood and Urine Evidence in Drug- or Alcohol-Related DWI Cases
Some Minnesota DWI testing involves blood or urine rather than breath, particularly when officers suspect impairment by drugs or another substance that a breath test cannot measure. Under Minnesota Statutes section 169A.51, blood and urine testing generally requires a search warrant or a recognized exception to the warrant requirement.
License Revocation Evidence and the 60-Day Deadline
A DWI arrest can also trigger a separate civil driver’s license proceeding. If you receive a notice and order of revocation or disqualification under Minnesota’s implied-consent law, you generally have 60 days after receiving the notice to petition the district court for judicial review. That deadline appears in Minnesota Statutes section 169A.53.
The evidence relevant to a license revocation for DWI in Minnesota can overlap with the criminal case, but the proceedings are separate. The notice of revocation, test record or laboratory certificate, officer certification, and other documentation may all matter. Because the petition deadline is short, prompt review is important.
Building a Defense Around the Actual Evidence
At Sieben Edmunds Miller, we evaluate the criminal case and any related license-revocation issues together. Depending on the circumstances, that may include reviewing video, reports, test records, warrants, laboratory materials, and procedural timelines, as well as discussing options such as Minnesota’s Ignition Interlock Program. If you are facing a DWI charge, reach out to us today to discuss the evidence and the issues that may matter in your case.
Frequently Asked Questions About Minnesota DWI Evidence
What evidence is commonly used to prove a DWI in Minnesota?
Prosecutors may use driving behavior, officer observations, statements, video, field sobriety tests, and evidentiary breath, blood, or urine results.
Can DWI evidence be challenged?
Yes. Depending on the facts, issues may involve the stop or detention, field sobriety testing, warrants, breath-testing procedures, sample collection, laboratory work, or inconsistencies between reports and video.
Is a roadside breath test the same as the station test?
No. A preliminary breath test is primarily a screening tool; an evidentiary breath test after arrest serves a different purpose and follows separate procedures.
Does a breath test over 0.08 automatically mean a conviction?
No. The state still must prove the charged offense beyond a reasonable doubt with admissible evidence, and the defense may examine the investigation, testing process, and reliability of the result.
How long do I have to challenge a Minnesota DWI license revocation?
Generally 60 days after receiving the notice and order of revocation or disqualification.
