Colorado DWAI vs. DUI — what is the difference and what are the penalties for each?

Colorado's two-tier alcohol-impaired driving system (C.R.S. § 42-4-1301): (1) DWAI — Driving While Ability Impaired: BAC between .05% and .079%; OR any impairment of the ability to operate a vehicle by alcohol, drugs, or both to 'the slightest degree.' A .05% BAC creates a rebuttable presumption of impairment. First offense: 2-180 days jail (2-day minimum if sentenced to jail; but jail may be suspended for community service); $200-$500 fine; 8 driver's license points (6 points = license suspension for young drivers); no mandatory license revocation for FIRST DWAI at .05%-.079%; (2) DUI — Driving Under the Influence: BAC .08% or above; OR actual impairment of ability to operate safely. First offense: 5 days to 1 year jail (5-day mandatory minimum if sentenced to jail); $600-$1,000 fine; 12 driver's license points; 9-month license revocation; mandatory 9-month ignition interlock requirement if convicted; (3) Per se DUI (.08%+): if the BAC is .08% or above at testing (within 2 hours of operating), this is per se DUI regardless of whether actual impairment is observable; (4) Persistent drunk driver (PDD): if BAC is .15% or above on ANY offense, the driver is classified as a 'persistent drunk driver' — triggering mandatory 2-year IID requirement (first offense) and enhanced fines; (5) Felony DUI (§ 42-4-1307): a 4th or subsequent DUI/DWAI conviction in Colorado is a Class 4 felony — 2-6 years prison; $2,000-$500,000 fine; permanent license revocation. Colorado is one of few states where the 4th+ DUI is an automatic felony regardless of any injury; (6) Points accumulation and suspension: Colorado uses a point system. 12+ points in 12 months or 18+ points in 24 months = license suspension. A first DWAI (8 points) plus any traffic violation can result in suspension.

Colorado cannabis DUI — how does the 5 ng/mL 'permissible inference' work?

Colorado cannabis DUI (§ 42-4-1301) and the 5 ng/mL standard: (1) What the law says: if testing shows 5 nanograms per milliliter or more of delta-9-THC in whole blood, a jury may infer that the person was under the influence of marijuana — a 'permissible inference' of impairment. This is different from a per se rule (where any BAC above .08% automatically constitutes DUI regardless of observable impairment). With the permissible inference, the inference can be rebutted by the defense; (2) Who it affects: regular cannabis consumers — particularly medical patients and habitual recreational users — can have blood THC levels above 5 ng/mL even when they are not subjectively impaired. THC distributes into fat tissue and is released gradually; heavy consumers may have persistent blood THC above 5 ng/mL even without recent consumption; (3) Defense strategies: (a) Expert testimony on the relationship (or lack thereof) between blood THC concentration and impairment; (b) Evidence of regular use that desensitizes the user to THC's impairing effects; (c) Challenging the timing of the blood test vs. when driving occurred (THC levels can drop or rise depending on timing); (d) Contesting the blood draw chain of custody and laboratory analysis; (e) Challenging the traffic stop's legality under McKnight (odor alone insufficient for probable cause); (4) No breath test for cannabis: Colorado (and most states) lacks a reliable roadside breath test for THC. Blood testing requires a warrant after arrest (based on probable cause of impairment from observation) or the driver's consent. Field sobriety tests are used to develop probable cause for arrest before requesting a blood test; (5) Combination cases: alcohol + cannabis combined are among the most difficult cases. The combination can produce synergistic effects on impairment, and blood testing shows both substances. Colorado juries receive instructions on how to evaluate evidence of combined impairment; (6) Compare Wisconsin: Wisconsin's zero-ng/mL standard means any detectable THC in blood is a per se violation. Colorado's 5 ng/mL permissible inference (not per se) allows more defense opportunity but still creates significant risk for regular cannabis consumers who drive.

Colorado Express Consent law — what happens if I refuse a blood or breath test?

Colorado's Express Consent Law (C.R.S. § 42-4-1301.1): (1) What Express Consent means: any person who drives or operates a motor vehicle on Colorado roads is deemed to have given consent to a chemical test of their blood, breath, saliva, or urine if lawfully arrested for DUI or DWAI. The word 'Express' is a Colorado-specific term for what most states call 'Implied Consent'; (2) Right to choose test type: under Colorado law, the driver who is arrested for DUI has the right to choose whether to take a breath test (using a Colorado-certified intoxilyzer instrument) or a blood test. If the driver cannot take a breath test (medical reasons), a blood test is used. The officer must advise the driver of this choice; (3) Refusal consequences: refusing to take ANY chemical test results in: 1-year revocation of Colorado driver's license for a first refusal (through the Colorado Department of Revenue DMV); 2-year revocation for second refusal; designated 'persistent drunk driver' (PDD) for chemical test refusal — triggering mandatory 2-year IID requirement; no criminal penalty for refusal itself (unlike some states that criminalize refusal); (4) Post-Birchfield implications: the U.S. Supreme Court in Birchfield v. North Dakota (2016) held that warrantless breath tests incident to DUI arrest are constitutional but warrantless blood draws require either consent or a warrant. Colorado's Express Consent for blood testing means the driver has 'consented' by driving — but the Birchfield analysis has been litigated in Colorado courts regarding whether Colorado's statutory consent scheme satisfies constitutional requirements; (5) Warrant for blood: Colorado officers can seek a warrant for a blood draw if the driver refuses. Colorado's electronic warrant system allows telephonic warrant issuance within minutes; (6) Refusal at trial: in Colorado, a DUI defendant's refusal to take a chemical test IS admissible at trial as evidence of consciousness of guilt — the prosecution can argue that the defendant refused because they knew they would test positive.

Colorado DUI penalties — how does the first offense compare to subsequent offenses?

Colorado DUI/DWAI sentencing escalation (§ 42-4-1307): (1) First DUI: 5 days to 1 year jail (5-day minimum if sentenced to jail, which can be served as in-home detention or community service in lieu of jail if the judge allows); $600-$1,000 fine; 12-month license revocation (can apply for early reinstatement at 3 months with IID); mandatory 9-month ignition interlock device (IID); up to 2 years probation; 48-96 hours public service; Level II alcohol education class; (2) Second DUI: 10 days to 1 year jail (10-day mandatory minimum, with 60-day in-home detention possible as alternative); $600-$1,500 fine; 1-year license revocation; mandatory IID for 2 years; (3) Third DUI: 60 days to 1 year jail (60-day mandatory minimum); $600-$1,500 fine; 2-year license revocation; mandatory IID for 2 years; (4) Fourth or subsequent DUI (FELONY, § 42-4-1307(4)): Class 4 felony; 2-6 years prison (Colorado Department of Corrections); $2,000-$500,000 fine; mandatory community parole supervision after release; permanent license revocation; this is triggered on the FOURTH total DUI/DWAI conviction regardless of when prior convictions occurred (no expiration — all prior DUIs count forever); (5) Persistent drunk driver (PDD, BAC .15%+ or refusal): enhanced IID requirement (2 years minimum on first offense); additional treatment requirements; (6) DUI with accident/injuries: separate charges (vehicular assault while under the influence — Class 4 felony; vehicular homicide while DUI — Class 3 felony, which is 4-12 years prison for the underlying offense, with Colorado Truth in Sentencing requiring service of at least 75% of the sentence for violent crimes); (7) Colorado DWAI on 4th offense: DWAI conviction counts alongside DUI convictions for the felony threshold — 3 prior DWAI/DUI convictions + 1 new DWAI = 4th offense FELONY.

Colorado ski resort DUI enforcement — are there specific issues at ski mountains?

Alcohol, cannabis, and driving in Colorado's ski resort communities: (1) Mountain resort enforcement context: Vail, Breckenridge, Keystone, Steamboat Springs, Aspen, and other resort towns see elevated DUI enforcement during ski season (November-April). Colorado State Patrol, local sheriffs (Eagle County Sheriff for Vail; Summit County Sheriff for Breckenridge/Keystone; Routt County Sheriff for Steamboat; Pitkin County Sheriff for Aspen), and local police departments conduct enforcement on US-6, US-24, SH-9, SH-82 (Maroon Bells corridor to Aspen), and I-70; (2) Apres-ski culture: Colorado resort towns have a significant 'apres-ski' drinking culture — bars and restaurants adjacent to ski resorts are full in the late afternoon as skiers come off the mountain. The drive from Vail to Denver on I-70 after apres-ski is a high-risk DUI zone; (3) Cannabis adds complexity: resort visitors who legally purchase cannabis from Breckenridge or Aspen dispensaries and then drive create cannabis DUI issues. The 5 ng/mL permissible inference applies; Colorado has cannabis consumption lounges in some resort areas where visitors can legally consume on-site and arrange rides rather than drive; (4) Driving on mountain roads: the combination of alcohol/cannabis impairment + I-70 mountain canyon driving (limited visibility, steep grades, narrow lanes in Glenwood Canyon) makes resort DUIs particularly dangerous. DUI accidents on mountain roads are frequently fatal given the terrain; (5) Lift ticket confiscation: ski resorts can and do confiscate lift tickets and ban skiers from the mountain for skiing while impaired (visibly drunk or high skiing is a violation of the Ski Safety Act's duty to ski in control). This is a civil resort enforcement action separate from DUI law; (6) Taxi/rideshare availability: resort areas have varying rideshare access — Aspen and Vail have robust taxi/rideshare alternatives; more rural resorts (Telluride, for instance, is accessible primarily by car or the gondola from Mountain Village) have more limited alternatives. Planning transportation before visiting Colorado ski resorts is not just advice — it's DUI risk management.

DUI & Traffic Laws in Colorado (2026)

Colorado DUI & Traffic Violations: the early sequence that protects options, stop record, and without making the page read like a template

A practical dui & traffic violations guide for Colorado readers who need clearer direction around stop record, chemical test issues, document control, and early next steps.

Reviewed January 2026 2 min read Official-source grounded Ver en Espanol En Español

Key Takeaways

Unique two-tier system: DWAI (.05%-.079% BAC, § 42-4-1301(2)): 2-180 days, 8 points; DUI (.08%+ BAC): 5 days-1yr, 12 points, 9-mo revocation + IID; DWAI is distinctly Colorado — no equivalent in Indiana/WI/MO/MD
Cannabis: 5 ng/mL delta-9-THC permissible inference (NOT per se) (§ 42-4-1301(6)); jury may but need not infer impairment; regular users can rebut with expert testimony; NO roadside breath cannabis test → blood warrant required
Express Consent (§ 42-4-1301.1): driver chooses breath OR blood test; refusal = 1-yr revocation + PDD designation + 2-yr IID; refusal admissible at trial as consciousness of guilt; Birchfield (2016) blood draw warrant analysis applies
Felony DUI: 4th or subsequent DUI/DWAI = Class 4 felony (§ 42-4-1307(4)) 2-6yr prison; no time limit — all prior DUI/DWAI count forever; Persistent Drunk Driver (PDD): BAC ≥.15% or refusal → mandatory 2-yr IID
Resort enforcement (Vail/Breckenridge/Aspen/Steamboat): apres-ski → I-70 mountain canyon = high-risk zone; Eagle/Summit/Pitkin County Sheriffs active; cannabis dispensaries in resort towns + 5 ng/mL rule = growing cannabis DUI issue

Key Numbers — Colorado All 50 states →

Filing Deadline 3 years

Fault Rule Modified Comparative

Insurance System At-Fault

Key Statute C.R.S. § 13-80-102

Compare with another state → Official source ↗

Photo by Kindel Media on Pexels

Colorado operates under a legal framework that no other state has precisely replicated: two separate criminal driving offenses for alcohol impairment — DUI (Driving Under the Influence, for BAC of .08% or above) and DWAI (Driving While Ability Impaired, for BAC between .05% and .079%). DWAI is distinctly Colorado. Indiana has DUI. Wisconsin has OWI. Missouri has DWI. Maryland has DUI and DWI. But Colorado's DWAI — "driving while ability impaired" at a .05% BAC threshold — creates a lower entry point for alcohol-impaired driving liability than any comparable state. A Colorado driver with a .05% BAC who a police officer observes making driving errors can be prosecuted for DWAI, a level 2 traffic misdemeanor carrying up to 180 days in jail, $200-$500 fine, 8 points on the license, and 6-month revocation for first offense. Many drivers who would not be arrested for DUI in other states can be arrested for DWAI in Colorado.

Colorado's cannabis DUI framework is more nuanced than Wisconsin's zero-nanogram approach and reflects Colorado's status as the first state to grapple systematically with legal cannabis and impaired driving. Colorado's § 42-4-1301(6) establishes a "permissible inference" — not a per se rule — for delta-9-THC at or above 5 nanograms per milliliter of whole blood: if a driver has 5 ng/mL or more of delta-9-THC in their blood at the time of testing, the jury may (but is not required to) infer that the driver was under the influence of marijuana. The 5 ng/mL permissible inference is rebuttal evidence that a defense attorney can contest — by presenting evidence that the driver was a regular cannabis consumer whose blood THC level exceeds 5 ng/mL without corresponding impairment, or by challenging the timing and accuracy of the blood test. This is fundamentally different from Wisconsin's zero-tolerance per se approach where any detectable THC is automatically a violation.

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