Cannabis DUI Laws in Colorado

Colorado (CO)Per Se THC Limit

This state sets a specific THC blood concentration limit. Drivers at or above this level are legally considered impaired.

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DUI Law Details

THC Limit

5 ng/mL blood

legal threshold

Testing Method

Blood, field sobriety, DRE evaluation

authorized methods

Implied Consent

Yes

required for licensed drivers

First Offense Penalty

5 days to 1 year in jail, fines $600-$1,000, 9-month license revocation

Test Refusal Penalty

1-year license revocation

Overview

Colorado was one of the first states to set a per se THC limit for driving. Under Colorado law, drivers with 5 nanograms or more of active THC per milliliter of blood create a "permissible inference" of impairment. This is not an absolute presumption — drivers can present evidence that they were not impaired despite exceeding the limit.

As the first state to legalize recreational cannabis (2012), Colorado has been a testing ground for cannabis DUI policy. The state uses a combination of blood testing, field sobriety tests, and DRE evaluations. Colorado also prohibits open cannabis containers in vehicles and consumption while driving.

Key Facts

•Per se limit of 5 ng/mL active THC in blood (permissible inference)
•Drivers can rebut the presumption of impairment with evidence
•First state to legalize recreational cannabis (Amendment 64, 2012)
•Open cannabis containers in vehicles are illegal
•Implied consent refusal results in 1-year license revocation
•DUID (Driving Under the Influence of Drugs) is a separate charge

Frequently Asked Questions

What is Colorado's THC driving limit?+

Colorado has a permissible inference limit of 5 ng/mL of active THC in the blood. If you are at or above this level, a jury may infer impairment, but you can present evidence to rebut that inference.

Is the 5 ng/mL limit an automatic conviction in Colorado?+

No. Unlike alcohol's per se limit, Colorado's THC limit creates a 'permissible inference' of impairment, not an automatic presumption of guilt. A driver can challenge the inference with evidence.

How long should I wait to drive after using cannabis in Colorado?+

There is no official safe waiting period. THC metabolism varies greatly between individuals. Frequent users may have elevated THC levels even when not impaired. The safest approach is to arrange alternative transportation.

What are the penalties for a first cannabis DUI in Colorado?+

A first-offense DUID carries 5 days to 1 year in jail, fines of $600-$1,000, a 9-month license revocation, and up to 96 hours of community service.

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Colorado Cannabis Market

Disclaimer: The information on this page is provided for educational and informational purposes only and does not constitute legal advice. Cannabis remains illegal under US federal law. Colorado DUI laws and regulations are subject to change and may vary by local jurisdiction. THC limits, penalties, and testing methods described here are based on publicly available information and may not reflect the most current regulations. Always verify current laws with official Colorado state resources and consult with a qualified attorney for legal guidance. Cannabismarketcap does not guarantee the accuracy or completeness of any information presented.