DWI Arrests in Minnesota: Probable Cause and "Physical Control"

What Gives Police Probable Cause for a DWI Arrest

An officer doesn't need to be certain you committed a DWI to arrest you — they need probable cause, meaning reasonable grounds, based on the facts and circumstances known to them, to believe you were impaired and connected to the vehicle. Minnesota courts treat "reasonable and probable grounds" as the same thing as "probable cause."

Importantly, the officer doesn't have to personally see you driving. They can develop probable cause from the totality of what they observe and learn — your condition, statements, the scene, and other evidence.

The Three Ways: Driving, Operating, or "Physical Control"

Minnesota's DWI law reaches more than just driving. It's a crime to drive, operate, OR be in physical control of a motor vehicle while under the influence. "Driving" and "operating" are straightforward — but "physical control" is the broad, heavily-litigated concept that surprises people most.

What "Physical Control" Means

You can be in "physical control" of a vehicle — and arrested for DWI — even if it's parked and not moving. The idea is whether you are in a position to exercise dominion or control over the vehicle: whether you could make it a source of danger without too much difficulty. The law is designed to stop an impaired person before they actually drive.

Minnesota courts (in State v. Starfield and State v. Fleck) weigh several factors:

• Your proximity to the vehicle;
• The location of the keys;
• Whether you were a passenger;
• Who owns the vehicle; and
• The vehicle's operability.

No single factor controls — it's the "overall situation." Courts have found physical control where a person was asleep behind the wheel with the keys in the console, where someone was standing near a running vehicle, and in other situations short of actual driving. On the other hand, mere presence in or near a vehicle is not enough by itself, and a genuinely intoxicated passenger who has handed control to a designated driver is not in physical control.

The Timing Connection

Probable cause for DWI requires connecting your impairment to the time you were driving or in control of the vehicle. It's not enough to show you were impaired at some point and were associated with a vehicle at some other point — there has to be a reasonable basis to believe you were impaired when you drove or controlled it. In accident cases especially, the time gap between the driving and the officer's observations can become an important issue.

Field Sobriety Tests

Officers often use field sobriety tests (FSTs) — like the walk-and-turn, one-leg-stand, and horizontal gaze nystagmus (eye) test — to build probable cause. Things to understand:

• FSTs are standardized, and how they're administered and scored can be challenged.
• Performance can be affected by factors unrelated to alcohol — medical conditions, injuries, footwear, weather, nervousness, and the testing surface.
• Probable cause can sometimes exist even without FSTs, based on other indicators (driving conduct, odor, speech, eyes, admissions).

Preliminary Breath Tests (PBTs)

A preliminary breath test (the roadside handheld device) is a screening tool used to help an officer decide whether there's probable cause to arrest. Key points:

• A PBT may be requested to assist the probable-cause determination — even if the officer is unsure whether you're impaired.
• The PBT is a screening device; it is different from the evidentiary chemical test that happens after arrest (see our DWI chemical-testing page).
• There must still be a lawful basis for the underlying stop and the request.

Special Situations

• Single-vehicle accidents: An accident or collision can be an alternative basis for invoking the implied-consent process — but the timing-connection issue above often matters here.
• Commercial vehicles: Drivers of commercial motor vehicles face a lower alcohol-concentration threshold and additional rules.
• Out-of-jurisdiction arrests: There are specific rules about when an officer can act outside their normal jurisdiction; a violation can sometimes be raised as an issue.

Why the Arrest Basis Matters So Much

The legality of the stop and arrest is often the foundation of a DWI defense. If the stop was unlawful, or there was no probable cause to arrest, evidence that followed — including chemical-test results — may be subject to suppression. Common challenges include:

• No reasonable suspicion for the initial stop (see our traffic-stops page);
• No probable cause connecting impairment to driving/control;
• A weak or improperly administered FST or PBT;
• A physical-control theory that doesn't fit the facts;
• A timing gap the state can't bridge.

Key Terms

• Probable cause: Reasonable grounds to believe a DWI occurred — the basis required to arrest.
• Physical control: Being in a position to control a vehicle while impaired — enough for DWI even when parked.
• Field sobriety test (FST): Roadside coordination/eye tests used to build probable cause.
• Preliminary breath test (PBT): A roadside screening device, distinct from the post-arrest evidentiary test.
• Temporal connection: The required link between impairment and the time of driving/control.