DUI vs. DWAI: Colorado’s Two-Tier System

Most states have a single drunk-driving charge. Colorado has two, and the distinction matters. Driving Under the Influence (DUI) applies when your blood alcohol concentration (BAC) is 0.08% or higher, or when a prosecutor can show that alcohol or drugs rendered you substantially incapable of driving safely. When your BAC is measured at 0.08% or above within two hours of driving, the charge is often filed as “DUI per se,” meaning the number itself supports the case regardless of how you appeared to the officer.

Driving While Ability Impaired (DWAI) is the lesser offense, triggered by a BAC between 0.05% and 0.079%. At that level, Colorado law allows a “permissible inference” that your ability to drive was affected. It is a lower bar than DUI — prosecutors only need to show your driving was impaired to the slightest degree — but a DWAI is still a criminal misdemeanor that carries jail time, fines, and points against your license. Importantly, there is no truly “safe” number below 0.08%: if an officer documents signs of impairment such as erratic driving or poor performance on field tests, you can be charged even with a low or borderline reading.

High-BAC and Persistent Drunk Driver Enhancements

Two thresholds sharply increase what is at stake. If your BAC is 0.15% or higher, Colorado designates you a Persistent Drunk Driver (PDD) — even on a first offense and even with no prior convictions — which brings extended ignition interlock requirements and mandatory alcohol education or treatment. A refusal to submit to chemical testing can trigger the same designation. Then, at 0.20% or above, the law imposes a mandatory minimum of ten days in jail on a first offense, where a lower first-offense reading might otherwise allow the court to suspend jail in favor of education or probation.

Marijuana and Drugged Driving

Cannabis is legal to buy and use in Colorado, but driving after using it is not treated any differently from alcohol under impaired-driving law. Colorado sets a “permissible inference” limit of five nanograms of active delta-9-THC per milliliter of whole blood. If a blood test meets or exceeds that level, a jury may infer impairment — but, as the Colorado Department of Transportation explains, that number is not conclusive proof. THC is fat-soluble and can linger in the bloodstream for days after any impairing effect has worn off, which is exactly why these cases are so contestable. A driver can also be convicted below five nanograms if the officer documents observable impairment, and a medical marijuana card offers no immunity.

Two Cases at Once: Criminal Court and the DMV

This is the part that catches many people off guard. An arrest starts a criminal case, but it also starts a completely separate administrative case at the Colorado DMV that can revoke your license on its own timeline, regardless of what happens in court. Under Colorado’s Express Consent Law, simply by driving on state roads you have agreed to chemical testing when lawfully arrested for suspected impaired driving. Refusing that test triggers an automatic license revocation — typically a full year — and the PDD designation, consequences that are often harsher than the underlying DUI.

The single most time-sensitive deadline after an arrest is this: you generally have only seven days to request a DMV hearing to contest the administrative revocation. Miss that window and the revocation can take effect without you ever getting to challenge it. Because the criminal and administrative tracks move independently, it is possible to prevail in one and still face consequences in the other — which is why many drivers work with counsel who handles both. Attorneys who regularly appear at DMV suspension hearings treat the seven-day deadline as the first order of business.

Penalties by Offense Level

Colorado’s penalties escalate steeply with each conviction, and prior offenses count even if they happened in another state. The following is a general overview — the exact sentence depends on BAC, aggravating factors, and the county:

• First DWAI: Up to 180 days in jail, fines of roughly $200 to $500, up to 48 hours of community service, and eight points against your license.
• First DUI: Five days to one year in jail, fines of roughly $600 to $1,000, 48 to 96 hours of community service, and up to two years of probation. A court may suspend the jail term for a first offense if you complete alcohol education or treatment — unless a high-BAC or PDD enhancement applies.
• Second offense (DUI or DWAI): Mandatory jail time, with a minimum ten consecutive days if a prior occurred within the last five years, plus extended interlock and treatment requirements.
• Third offense: A mandatory minimum of 60 days in jail. Three impaired-driving convictions within seven years also trigger a five-year license revocation under Colorado’s habitual traffic offender statute.
• Fourth offense: A class 4 felony — punishable by a state prison sentence — rather than a misdemeanor. (The felony threshold currently sits at the fourth conviction, but it is an area defense attorneys are watching closely for legislative change.)

Beyond jail and fines, a conviction can require an ignition interlock device (IID) for license reinstatement, mandatory education classes, a Victim Impact Panel, and surcharges — and it leaves a lasting mark on your record that can affect employment, insurance, and housing.

How a Real Defense Is Built

A DUI charge is not a conviction, and a chemical test result is not the end of the story. Impaired-driving cases have more moving parts than most people realize, and each part is a potential defense angle:

• The stop itself. An officer needs reasonable suspicion to pull you over and probable cause to arrest. If the initial stop was unlawful, evidence that flowed from it can be challenged.
• Field sobriety testing. These tests must be administered according to standardized procedures, on suitable ground, accounting for medical conditions, injuries, footwear, and nerves that can mimic impairment.
• Breath-machine reliability. Breath testing instruments require regular calibration and maintenance. Gaps in calibration logs or certification records can undermine a reading.
• Blood draw and chain of custody. Blood tests must follow strict collection, storage, and handling protocols. A break in the chain of custody or improper draw can call the result into question.
• Rising blood alcohol. Alcohol absorbs over time, so your BAC while driving may have been lower than the number recorded later at the station.
• Lingering THC. Because delta-9-THC can remain in the blood long after impairment ends, a positive marijuana test does not establish that you were actually impaired behind the wheel.

Thorough investigation is where cases are won or narrowed. Even when the evidence looks strong, uncovering a weakness — a procedural error, an unreliable test, a questionable stop — can create leverage in plea negotiations or open the door to reduced or dismissed charges. This is why choosing counsel who focuses specifically on criminal defense, rather than a general practitioner, tends to matter: an experienced Denver DUI defense attorney who spends every day on these cases is better positioned to spot the details that others overlook.

What to Do If You’re Arrested for DUI or DWAI

The decisions you make in the first hours carry real weight. A few principles protect you regardless of the facts:

• Stay calm and polite. How you treat the officer becomes part of the record.
• Know your rights before you speak. You are not required to answer questions about where you have been or what you have had to drink. You can respectfully decline and ask to speak with an attorney.
• Understand the consequences of refusal. Refusing a chemical test after a lawful arrest triggers its own automatic license revocation and PDD designation — a serious decision with lasting effects.
• Write down everything. As soon as you can, note the time, location, what was said, and what tests were performed. Details fade fast and can matter later.
• Act on the seven-day DMV deadline. Do not wait for your court date to think about your license.
• Consult a defense attorney early. Early involvement gives counsel the best chance to preserve evidence and protect your options.

Frequently Asked Questions

Can I be charged with a DUI in Colorado if my BAC is under 0.08%?

Yes. A BAC between 0.05% and 0.079% supports a DWAI charge, and even below 0.05% you can face charges if an officer documents observable impairment.

How long do I have to save my driver’s license after a DUI arrest?

Generally seven days from the arrest (or from when blood results come back) to request a hearing with the Colorado DMV. Missing this deadline can cost you the chance to contest the revocation.

Is a marijuana DUI treated differently from an alcohol DUI?

The permissible-inference threshold is five nanograms of active delta-9-THC per milliliter of blood, but the charge and penalties fall under the same impaired-driving framework. Because THC lingers long after impairment, these cases are often highly contestable.

When does a Colorado DUI become a felony?

A fourth impaired-driving conviction is charged as a class 4 felony. Certain cases involving serious injury or death can also be charged as felonies regardless of prior record.

The Bottom Line

A DUI or DWAI charge in Colorado is serious, but it is not hopeless. The state’s two-track system, its strict deadlines, and its escalating penalties reward drivers who understand the process and act quickly — and they punish those who do nothing. If you are facing an impaired-driving charge along Colorado’s Front Range, speaking promptly with a Denver criminal defense attorney who handles both the criminal case and the DMV hearing can help you protect your license, your record, and your future before the clock runs out.

Disclaimer: This article is provided for general informational purposes only and does not constitute legal advice. Reading it does not create an attorney-client relationship. Impaired-driving laws change and their application depends on the specific facts of each case. For advice about your situation, consult a licensed Colorado attorney. For official information, see the Colorado General Assembly and the Colorado Division of Motor Vehicles.