Last reviewed: November 1, 2026
A common misconception in Colorado is that police always need a search warrant to look inside a car after arresting the driver for driving under the influence (DUI) or driving while ability impaired (DWAI). Often they don’t. But the warrantless search still has to be justified, and its limits are where many search challenges are won.
Do Police Need a Warrant to Search My Car During a Colorado DUI Stop?
Not always. The Fourth Amendment generally requires a warrant supported by probable cause, but courts treat vehicles differently than homes. If officers have probable cause to believe a car contains evidence of a crime, they can typically search it on the spot without a warrant, under what’s known as the automobile exception. The key question in any DUI case is whether officers actually had probable cause to believe evidence was in the car, and in the specific places they searched.
What Is the Fourth Amendment’s Automobile Exception?
In Carroll v. United States, 267 U.S. 132, 153 (1925), the U.S. Supreme Court held that warrantless vehicle searches can be reasonable because cars can be moved quickly, making it impractical to wait for a warrant. That rule became known as the automobile exception. The Court later added that people have a lesser expectation of privacy in a vehicle traveling on public roads than in a home (California v. Carney, 471 U.S. 386, 391-92 (1985)).
Do Colorado Police Need an Emergency to Search Without a Warrant?
No. Older Colorado cases described the automobile exception as requiring both probable cause and a practical risk that the vehicle would disappear before a warrant could be obtained. But the Colorado Supreme Court has since made clear that the automobile exception “does not have a separate exigency requirement”: if “a car is readily mobile and probable cause exists to believe it contains contraband,” police may search it “without more” (People v. Allen, 2019 CO 88, ¶ 32, quoting Maryland v. Dyson, 527 U.S. 465, 467 (1999); reaffirmed in People v. Furness, 2025 CO 16, ¶ 17). That means the fight in most cases is over probable cause, not urgency.
What Did the Colorado Supreme Court Decide in People v. Furness?
In People v. Furness, 2025 CO 16 (Colo. Apr. 14, 2025), officers responding to a reported shooting found the defendant near his car, saw an empty whiskey bottle and an empty gun case through the windows, and arrested him for violating a protection order that barred him from drinking. After a witness identified him as the shooter, officers searched the car, including the trunk, where they found a handgun. The trial court suppressed the trunk evidence, reasoning that officers had probable cause to search the passenger compartment but not the trunk. The Colorado Supreme Court reversed, finding that the specific facts, including that the defendant was standing next to the trunk with the windows down when officers arrived, gave officers probable cause to believe the gun was in the trunk.
How Far Can Police Search Under the Automobile Exception?
When probable cause exists, it can justify searching “every part of the vehicle and its contents that may conceal the object of the search,” including the trunk, glove box, and containers inside (Furness, ¶ 19). But that power has a firm limit. Officers may search a particular location only if they have probable cause to believe that location contains evidence of a crime, and they “cannot broaden the search, for example, from the passenger compartment to the trunk, without probable cause to believe that the trunk also contains evidence” (Furness, ¶ 20).
Does a DUI Arrest Give Police Probable Cause to Search My Car?
Not automatically. Probable cause to arrest you for DUI doesn’t by itself give officers probable cause to search your car. They need specific facts suggesting evidence is in the vehicle, such as an open container in plain view, and the search can only extend to places where that evidence could reasonably be. Whether those facts existed, and whether the search stayed within its limits, is often where a challenge begins.
Can You Challenge a Vehicle Search in Your DUI Case?
Yes. The facts of every case are different, and some provide a real opening to challenge how a search was conducted, which can lead to suppression of evidence the prosecution wants to use against you. If you’re facing a DUI or DWAI charge in Colorado and have concerns about how law enforcement treated you or your vehicle, contact Mile High Legal so we can walk through the law as it applies to your case. Nothing here is legal advice, and no attorney can promise a specific result.
Next step: If your car was searched during a Colorado DUI stop and you aren’t sure it was lawful, contact Mile High Legal for a case review before your next court date.
