Inventory Searches, Impound, and DWI Testing in Minnesota

Inventory Searches

An inventory search is the cataloguing of a lawfully impounded vehicle's contents — to protect the owner's property, guard against false claims of loss, and ensure nothing dangerous is stored. It's a recognized exception to the warrant requirement, but it depends on meeting all of these requirements:

1. The vehicle must be lawfully in police custody, usually through impoundment;
2. The impoundment itself must be necessary and proper — the state's interest must outweigh your right to be free of the intrusion;
3. The impoundment must follow standardized criteria;
4. The inventory must be conducted under standard police procedure; and
5. The prosecution bears the burden of establishing all of this.

The Anti-Pretext Rule

This is the heart of an inventory-search challenge: an inventory search may not be a pretext. If an officer's sole motivation is to discover evidence of a crime, the search is unlawful — it must genuinely be an administrative "caretaking" function, not an investigation in disguise. Opening containers during an inventory must also follow a standardized policy (a policy of opening all, none, or a defined category is fine — but unbridled officer discretion is not).

What this means for you: Inventory searches are often vulnerable to challenge because, in practice, police and prosecutors are sometimes casual about proving the existence of, and compliance with, the specific written policy. If the state can't establish the standardized procedure was actually followed — or if the impound itself wasn't justified — the search may not hold up.

When Is Impound Even Justified?

Impoundment must be necessary — for example, to remove a vehicle blocking traffic or creating a hazard. Importantly, in Minnesota (under State v. Gauster), if you're able to make your own arrangements for the vehicle (and aren't under arrest preventing it), there may be no justification to impound — and without a lawful impound, there's no lawful inventory search. A vehicle on a busy freeway is different from one safely parked on a quiet street.

Being Placed in a Squad Car

Minnesota provides notable protection here. Under State v. Askerooth, confining a stopped driver in a squad car requires more than a minimal need to check identity or license status — and can't be justified by mere convenience or a generic interest in officer safety. It must be supported by the original basis for the stop, a new crime discovered during the stop, or a particularized, objectively reasonable threat to officer safety. This matters because improper confinement can taint what follows.

Caretaking / Public Safety Searches

In limited circumstances, police may conduct a warrantless "community caretaking" search of a vehicle to protect the public — the classic example (Cady v. Dombrowski) involved securing a firearm believed to be in an impounded car. This doctrine is real but limited. Notably, the U.S. Supreme Court has since declined to extend community caretaking to justify warrantless entry into a home (Caniglia v. Strom, 2021), keeping the doctrine relatively narrow.

DWI Chemical Testing: Breath vs. Blood

If you're arrested for DWI, the rules for chemical testing changed significantly in Birchfield v. North Dakota (2016) — a case decided alongside a Minnesota case. The core distinction:

• A breath test can be required without a warrant as a search incident to a DWI arrest — it's considered minimally intrusive.
• A blood test generally requires a warrant (or a valid exception like genuine exigent circumstances), because it's far more intrusive.
• A driver cannot be criminally punished for refusing a blood test based solely on implied consent — though civil consequences (like license revocation) can still apply.

What this means for you: In a DWI case, whether the test was a breath or blood test — and whether police got a warrant for blood — can be a critical issue. A warrantless blood draw without a valid exception may be challengeable, and the way refusal was handled matters.

Searches Where There's No Expectation of Privacy

Some areas don't carry a reasonable expectation of privacy — for example, a vehicle identification number visible through the windshield, or contraband in plain view. Observations from a lawful vantage point generally don't count as a "search" at all.

How These Searches Get Challenged

• Unlawful impound — impoundment wasn't necessary, or you could have made your own arrangements (Gauster).
• Pretextual inventory — the real purpose was to find evidence.
• No standardized procedure — the state can't establish the policy or that it was followed.
• Improper squad-car confinement (Askerooth).
• Warrantless blood draw in a DWI case without a valid exception (Birchfield).

Key Terms

• Inventory search: Cataloguing an impounded vehicle's contents under standardized procedure.
• Pretext: Using an administrative search as a disguised criminal investigation — not allowed.
• Impoundment: Taking a vehicle into police custody; must be necessary and proper.
• Implied consent: The DWI testing framework — refusal of a breath test carries different consequences than refusal of a blood test.