Cannabis DUI Laws in Illinois

Illinois (IL)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, saliva, field sobriety

authorized methods

Implied Consent

Yes

required for licensed drivers

First Offense Penalty

Up to 1 year in jail, fines up to $2,500, 1-year license revocation

Test Refusal Penalty

12-month license suspension (first), 3 years (second)

Overview

Illinois, which legalized recreational cannabis in 2020, has established a per se THC limit of 5 nanograms per milliliter of blood (or 10 ng/mL of another bodily substance). Drivers at or above this threshold are presumed to be impaired.

The state also allows the use of oral fluid roadside testing. Illinois's Cannabis Regulation and Tax Act specifically addressed DUI concerns by codifying the THC driving limits alongside legalization. The state has invested in DRE training and roadside testing technology to enforce these limits.

Key Facts

•Per se limit: 5 ng/mL THC in blood or 10 ng/mL in other bodily substances
•Recreational cannabis legalized January 1, 2020
•Oral fluid roadside testing is authorized
•12-month license suspension for first test refusal
•Open cannabis containers in vehicles are prohibited
•Medical patients are also subject to the per se limit

Frequently Asked Questions

What is Illinois's THC driving limit?+

Illinois has a per se limit of 5 ng/mL of THC in whole blood or 10 ng/mL in another bodily substance (such as saliva or urine).

Can police use saliva tests for THC in Illinois?+

Yes. Illinois law authorizes the use of oral fluid testing as a roadside screening tool for cannabis impairment.

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

A first offense carries up to 1 year in jail, fines up to $2,500, a 1-year license revocation, and possible mandatory drug treatment.

Are medical cannabis patients exempt from the THC limit in Illinois?+

No. Medical cannabis patients are subject to the same 5 ng/mL THC driving limit as all other drivers in Illinois.

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Illinois 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. Illinois 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 Illinois state resources and consult with a qualified attorney for legal guidance. Cannabismarketcap does not guarantee the accuracy or completeness of any information presented.