DWI Test Refusal in Minnesota: What Counts, and How to Defend It

Which Refusals Are a Crime?

This is the threshold question, and the answer changed in recent years. Under current law:

• Refusing a breath test (requested under the implied consent law after arrest) is a crime;
• Refusing a blood or urine test that is backed by a search warrant is a crime; but
• Refusing a warrantless blood or urine test is NOT a crime. Police generally need a warrant for blood or urine, and you can lawfully decline a warrantless blood/urine request and ask them to get a warrant.

(The roadside preliminary breath test — the PBT — is different and can be refused without it being a crime; see our field sobriety tests page. For the full breath-vs-blood/urine warrant rules, see our DWI chemical testing page.)

What Legally Counts as a "Refusal"

Refusal isn't limited to saying "no." Courts have found a refusal based on:

• Affirmative conduct — actively declining or obstructing the test;
• Silence or uncooperation — refusing to answer or engage can be treated as a refusal; and
• "Playing games" with a breath test — repeatedly not blowing properly. In one well-known case a driver who made many attempts without giving an adequate sample was deemed to have refused, even though she said she was trying.

On a breath test, you generally must provide two separate adequate samples. Failing to do so counts as a refusal — unless the failure is due to a genuine physical inability, in which case the officer must offer a blood or urine test instead. Courts also recognize a short window (historically a few minutes) to provide a sample, and disputes often turn on whether the driver was actually given a fair opportunity.

Once You Refuse, a Change of Mind Usually Doesn't Help

Generally, once you've refused, you're bound by that choice — agreeing to test a few minutes later (for example, after talking to someone) usually doesn't obligate the officer to re-offer the test. This is one reason the decision to test or refuse is so consequential, and why the right to consult a lawyer first matters (see our pretest right to counsel page).

The "Reasonable Refusal" Defense

Minnesota recognizes an affirmative defense that a refusal was reasonable. To use it, the driver must show the actual reason they refused and that the reason was a reasonable basis for refusing. This is a real but demanding defense — and the case law shows what usually does not qualify:

• Confusion — generally not enough by itself, unless the confusion was caused by the officer's misleading actions and was apparent to the police so they should have cleared it up;
• Advice of counsel to refuse — a lawyer telling you to refuse is not a reasonable basis to refuse;
• Mistrust of the testing equipment or police — generally not a valid basis; and
• Denial of driving or post-driving consumption claims — these are addressed on their own terms and don't automatically excuse a refusal.

Physical inability, by contrast, is a recognized defense: if you genuinely couldn't provide a breath sample (for medical reasons), that's not a refusal — but an alternative test should be offered.

The Prescription-Drug and Necessity Defenses

Minnesota law also recognizes a prescription-drug defense in this area (added by the legislature) and, in narrow circumstances, a necessity defense. These are limited and fact-specific, but they can matter in the right case. (Necessity is generally not available in the civil implied-consent license proceeding — see our implied consent page.)

Why Refusal Cases Are Worth Fighting

Refusal charges have real defense angles:

• Was the test one you could be required to take? A warrantless blood/urine refusal isn't a crime.
• Was the stop and arrest lawful? If not, the refusal charge can fall with the rest of the case (see our DWI traffic stops page).
• Was there a genuine physical inability, or were you not given a fair opportunity to complete the test?
• Was the advisory properly given, and was your right to consult counsel honored?
• Does a reasonable-refusal, prescription-drug, or necessity defense fit the facts?

Because a refusal conviction can be more serious than the DWI, these questions are worth a careful look.

Key Terms

• Test refusal: Declining a required chemical test — a separate crime for breath and warrant-backed blood/urine tests.
• Two adequate samples: The breath-test requirement; failing without physical inability counts as refusal.
• Reasonable refusal: An affirmative defense requiring proof of the actual, reasonable reason for refusing.
• Physical inability: A genuine medical inability to provide a sample — not a refusal.
• Aggravating factor: Why a refusal is a gross misdemeanor at minimum.