You were not speeding. You were not weaving. The officer has no reason to think you have been drinking.
Can police still stop you?
In Colorado, yes. Courts have upheld properly operated DUI checkpoints, even when officers have no individual reason to suspect a particular driver.
But putting up a sign does not make every stop legal. How police plan the checkpoint, select vehicles, and treat drivers matters. So does what happens after that first contact.
As a former prosecutor and a Colorado Springs criminal defense attorney, I look at both questions: Was the checkpoint lawful, and did the officer have a legal basis for what happened next?
Quick Summary
- Yes, DUI checkpoints are legal in Colorado when operated in accordance with constitutional requirements.
- Police can stop drivers without individual reasonable suspicion at a valid sobriety checkpoint.
- Checkpoint procedures matter. Police must use reasonable, neutral stopping procedures and limit the initial screening.
- Drivers can legally turn away before reaching a checkpoint, but an illegal or unsafe maneuver may give police grounds for a separate traffic stop.
- A checkpoint does not automatically authorize further detention or a vehicle search. Police need a lawful basis for extending an investigation or searching the vehicle.
- A DUI checkpoint arrest can be challenged. An attorney can review the stop, testing procedures, and available evidence for constitutional violations.
Why Police Can Stop You at a DUI Checkpoint
A checkpoint stop is a seizure. You are required to stop, and you are not free to keep driving. The Fourth Amendment and Article II, Section 7 of the Colorado Constitution protect against unreasonable seizures.
For an ordinary traffic stop, police generally need reasonable suspicion of a violation. A properly operated sobriety checkpoint is an exception to that requirement.
In Michigan Department of State Police v. Sitz, 496 U.S. 444 (1990), the U.S. Supreme Court upheld a sobriety checkpoint program. The Court balanced the government’s interest in preventing impaired driving, how the program advanced that interest, and the intrusion on motorists.
Colorado followed that year in People v. Rister, 803 P.2d 483 (Colo. 1990), and Orr v. People, 803 P.2d 509 (Colo. 1990). Those decisions upheld particular checkpoints under both the federal and Colorado constitutions.
The takeaway is straightforward. Police do not need to see you commit a traffic violation before stopping you at a valid sobriety checkpoint. They still have to operate it reasonably.
What Makes a Colorado DUI Checkpoint Legal?
There is no simple checklist that automatically decides every case. Colorado courts consider the circumstances as a whole. The following features helped support the checkpoints approved in Rister and Orr.
Planning and limits on officer discretion
Written instructions and supervisory decisions help keep officers from choosing whom to stop on a whim. We examine who approved the operation, how the location was selected, and what instructions officers received.
A neutral stopping procedure
The approved checkpoints generally stopped all approaching traffic in the designated direction, with procedures for letting traffic pass when it backed up. Arbitrary selection is a concern. Letting vehicles through to manage congestion is not automatically a violation.
Warning signs and a safe setup
Signs, cones, visibility, and lighting help drivers recognize an official police operation and navigate it safely.
Brief contact
Officers should keep the initial screening limited. A checkpoint does not authorize an open-ended investigation of everyone who drives through it. If their contact generates reasonable suspicion of a DUI or other crime, the stop can legally be extended. If they observe bloodshot watery eyes, odor of alcohol, slurred speech, etc. that can be a reason to investigate further.
These are factors to examine, not guarantees that any single missing detail will get a case dismissed. A policy violation and a constitutional violation are not always the same thing.
Do Police Have to Announce the Checkpoint?
Advance publicity can support a checkpoint’s deterrent purpose. Both agencies in Rister and Orr publicized their operations. Neither decision established a separate rule requiring police to publish the exact location in advance.
Can Police Use a DUI Checkpoint to Look for Other Crimes?
The checkpoint program’s primary purpose matters.
In City of Indianapolis v. Edmond, 531 U.S. 32 (2000), the U.S. Supreme Court rejected checkpoints primarily intended to find illegal drugs. General crime control does not justify that kind of suspicionless stop.
That is different from checking for impaired drivers, including drivers impaired by drugs. Drugged driving remains a road-safety concern.
Police may also act on evidence of another offense they lawfully encounter during a valid checkpoint stop. Finding another violation does not, by itself, invalidate the checkpoint. The issue is whether sobriety screening was the actual primary purpose of the program.
Can You Turn Before Reaching a DUI Checkpoint?
Generally, you can take a lawful turn before entering the checkpoint. The plans discussed in Rister and Orr allowed drivers to turn away before reaching the stop. Rister’s guidelines required something beyond merely turning around to justify pursuit.
That does not mean every maneuver is protected. An illegal U-turn, an unsafe turn, or a failure to signal when required may provide a separate reason for a stop. Other circumstances can also affect whether police have reasonable suspicion.
The distinction is between choosing another lawful route and committing a violation while trying to avoid police. Once an officer lawfully directs you to stop, comply with that direction. You can challenge the stop in court.
What Can Police Do After Stopping You?
At the initial contact, an officer may request driving documents and observe whether you show signs of impairment. Further detention or testing raises separate legal questions.
An officer does not automatically need reasonable suspicion merely to direct traffic into an adjacent screening area. The location of the contact is not the deciding factor. Its purpose, duration, and scope matter.
If the officer extends your detention to investigate suspected impairment or another offense, there must be an adequate legal basis. Unrelated questions are not automatically unconstitutional, but police generally cannot prolong a completed stop for an unrelated investigation without additional justification. Rodriguez v. United States, 575 U.S. 348 (2015), explains that distinction in the traffic-stop context.
Are Roadside Sobriety Tests Voluntary?
The walk-and-turn and one-leg stand are different from the evidentiary blood or breath test used under Colorado’s express consent law.
In People v. Carlson, 677 P.2d 310, 317–18 (Colo. 1984), the Colorado Supreme Court held that roadside sobriety testing is a search requiring probable cause to arrest for DUI or DWAI, or voluntary consent. The Court of Appeals restated that rule in People v. Young, 2024 COA 1, paragraphs 11–17.
If the officer is asking for your consent to perform roadside maneuvers, you can decline.
When consent is disputed, the officer’s words and conduct matter. We review whether the driver voluntarily agreed or submitted to coercion. Young also makes clear that a missing refusal advisement does not automatically make consent involuntary.
What About the Handheld Breath Test?
A preliminary breath test used for roadside screening is different from an evidentiary breath test requested under express consent. The preliminary-test provision is C.R.S. § 42-4-1301(6)(i).
The officer must advise the driver that the preliminary test can be refused. That choice also applies to drivers under 21 under this preliminary-screening provision. The screening result can help an officer decide whether probable cause exists. Its use in court is restricted.
Colorado enacted SB26-132 in 2026. It requires officers, subject to exceptions, to offer a voluntary preliminary alcohol screening test after collisions involving death or suspected serious bodily injury. It does not make preliminary breath testing mandatory for everyone at a sobriety checkpoint.
You can, and probably should, refuse a PBT.
What Happens If You Refuse the Express Consent Test?
Under C.R.S. § 42-4-1301.1, probable cause to believe a driver committed a qualifying impaired-driving offense can trigger an evidentiary testing request.
Refusing that request can have serious consequences. A first refusal generally carries a one-year license revocation, although qualifying drivers may have an early reinstatement option. A refusal can also be introduced at trial. Fitzgerald v. People, 2017 CO 26, upheld the admission of refusal evidence against a Fourth Amendment challenge.
If the police have probable cause to charge you with a DUI, even though you didn’t take a test, you will still be charged. Refusal to take a test doesn’t mean they can’t/won’t charge you with a DUI. I see refusal cases all the time. Probably half of my DUI cases are refusal cases.
Do not assume that completing roadside maneuvers or a preliminary breath test satisfies a later express consent request. Refusing a PBT test and an evidentiary chemical test are different. If you refuse the official blood or breath test you can have additional license consequences.
Related:
Does a Checkpoint Let Police Search Your Car?
The checkpoint alone does not authorize a vehicle search. Police need a separate lawful basis, such as valid consent, a warrant, or an applicable exception to the warrant requirement.
An officer asking permission to search is asking for consent. You can decline consent. Whether police can search anyway depends on the other facts and the legal authority they claim.
How We Challenge a DUI Checkpoint Arrest
The review starts with the records. We want the operational plan, approval records, officer instructions, traffic logs, and available recordings. We also examine the placement of signs, the stopping procedure, and the reason for selecting the location.
Then we compare those records with your stop. How long were you detained? What did the officer observe? When did the investigation expand? What was the basis for the tests, arrest, or search?
If police violated your constitutional rights, a motion to suppress may keep resulting evidence out of the criminal case. Suppression is not automatic, and it does not always result in dismissal. The court must consider the violation, its connection to the evidence, and any applicable exceptions.
Even if the checkpoint was valid, there may still be problems with the officer’s investigation or the reliability of the testing. Those issues deserve their own review.
Do Not Miss the DMV Deadline
Your criminal case and your license case are separate proceedings.
For an express consent revocation, the hearing request generally must be made within seven days after you receive the notice of revocation or are legally deemed to have received a mailed notice. The deadline does not simply start after your license has already been revoked.
After a qualifying breath result or an alleged refusal, the officer commonly serves the notice directly. When blood results come back later, DMV may send the notice by mail. Read the deadline on the notice and act immediately. Do not wait for your first court date.
Talk With a Colorado Springs DUI Defense Attorney
If you were arrested at a sobriety checkpoint, we can review the stop, the testing, and your options in court and at DMV.
The McDowell Law Firm represents people charged with DUI and DWAI in Colorado Springs, El Paso County, Teller County, and surrounding Colorado courts.
Call 719-227-0022 for a free consultation.
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