Minnesota DWI Blood Draw and Urine Test: Warrants, Rights, and Refusal

Most Minnesota DWI arrests involve a breath test at the station. But in some situations — suspected drug impairment, medical inability to provide a breath sample, or cases where blood alcohol evidence needs to be preserved — officers request a blood draw or urine test instead. The legal framework for these tests is different from breath testing, and the differences matter.

When Blood or Urine Tests Are Used

Breath tests detect alcohol only. When an officer suspects impairment from drugs, a controlled substance, or a combination of drugs and alcohol, a breath test won't capture the full picture. In these situations, the officer will request a blood draw or urine test.

Blood draws are also used when a driver is physically unable to provide an adequate breath sample — which can happen with lung conditions, injuries from an accident, or medical situations at a hospital following a crash.

Minnesota law treats these tests as more invasive than a breath test, which triggers specific procedural requirements.

The Warrant Requirement

Following the U.S. Supreme Court's decisions in Missouri v. McNeely (2013) and Birchfield v. North Dakota (2016), warrantless blood draws in DWI cases are unconstitutional absent exigent circumstances. Minnesota applies this framework strictly: officers must obtain a search warrant from a judge before conducting a blood draw.

In practice, Minnesota has streamlined the warrant process through telephonic and electronic warrant applications. Officers can contact a judge, present the probable cause affidavit by phone or electronically, and receive a signed warrant — often within 30 to 60 minutes. This speed means the warrant requirement doesn't usually prevent the test from happening, but it does create a documented judicial authorization that becomes part of the case record.

Urine tests under warrant follow the same procedural requirements. The officer obtains a warrant authorizing a urine sample, and the collection must follow established forensic protocols.

The Temporary Permit Difference

Here's a detail that catches people: the temporary driving permit period is shorter for blood or urine test refusals under a warrant. While breath test failures and refusals trigger a 14-day temporary permit under the 2025 HF 2130 reforms, blood or urine test refusals pursuant to a search warrant carry a 7-day temporary permit under Section 171.177.

This compressed window means even less time to arrange alternative driving privileges before the full revocation kicks in. If you refused a blood draw requested under a warrant, verify the expiration date on your temporary permit immediately — it may be half the time you assumed.

Refusal Consequences

Refusing a properly warranted blood draw or urine test carries the same consequences as refusing a breath test: a separate gross misdemeanor criminal charge (up to one year in jail and $3,000 fine) and a mandatory one-year administrative license revocation.

There's an important nuance here. Under Birchfield, criminal penalties for refusing a blood test without a warrant would be unconstitutional. But when the officer has obtained a valid warrant, refusing becomes both a criminal offense and a basis for administrative revocation. The warrant transforms the legal landscape — a warranted blood draw request carries the full weight of the implied consent framework.

Chain of Custody and Testing Protocols

Blood and urine samples must follow chain-of-custody protocols from collection through analysis. The blood draw must be performed by a qualified medical professional (physician, registered nurse, or qualified medical technician), and the sample must be sealed, labeled, and transported to the Bureau of Criminal Apprehension (BCA) laboratory under documented chain of custody.

These procedural requirements create potential grounds for challenging the test results in both the criminal case and the administrative Implied Consent hearing. If the chain of custody was broken, the collection wasn't performed by a qualified individual, or the sample wasn't properly preserved, the test results may be suppressed or their reliability challenged.

What This Means for Your Case

If your DWI arrest involved a blood draw or urine test rather than a breath test, several practical considerations apply:

Results take longer. Breath test results are available at the station within minutes. Blood and urine analysis at the BCA lab can take weeks to months. Your criminal case may proceed through initial hearings before the toxicology results are available.

The challenge opportunities are different. Blood and urine testing involves more procedural steps than a breath test, which means more potential points of failure in the state's evidence chain. An attorney evaluating your case will look at the warrant application, the collection protocol, the chain of custody, and the lab analysis methodology.

The administrative timeline is the same. Regardless of which test was used, the 60-day deadline for filing an Implied Consent petition to challenge the administrative revocation applies. Don't wait for lab results before deciding whether to file — the deadline doesn't care about the testing timeline.

The Minnesota First-Offense DUI Guide covers the testing framework and the Implied Consent petition process, including the specific grounds for challenging test results in both the criminal and administrative tracks.

See more Minnesota guides →