Guide · the law · checked Sep 25, 2026

Cannabis and driving in Illinois

What Illinois law says about cannabis in your car, from the Vehicle Code and the June 2026 changes. This is general information, not legal advice.

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Quick answer

You can drive with cannabis in the car in Illinois if it's in a secured, sealed or resealable, odor-proof, child-resistant container kept out of reach. Since June 12, 2026, the out-of-reach part doesn't apply when it's still sealed in the dispensary's original packaging. Nobody may use cannabis in a vehicle, and driving with 5 ng/mL or more of THC in whole blood (10 ng/mL in other bodily substances) within 2 hours of driving, or while impaired, is DUI.

Updated Sep 25, 2026

The container rule

625 ILCS 5/11-502.15 says a driver may only have cannabis in a vehicle in a secured, sealed or resealable, odor-proof, child-resistant cannabis container that is inaccessible. Passengers have the same rule for the passenger area.

On June 12, 2026, SB 3222 (Public Act 104-0463) added an exception in the Cannabis Regulation and Tax Act: the inaccessibility requirement doesn't apply to cannabis bought from a licensed dispensary and carried in a secured, sealed, odor-proof, child-resistant container in its original packaging. It sits right beside the new drive-thru and pickup rules in the same section of the law.

Unopened, in the store's packaging: doesn't have to be out of reach.
Opened, or moved to another container: still has to be sealed, odor-proof, child-resistant and out of reach. The trunk is the simple answer.
Using it in the car: not allowed for anyone, parked or moving.

One note of caution: a separate section of the Cannabis Regulation and Tax Act (410 ILCS 705/10-35) still says cannabis in a private vehicle must be "reasonably inaccessible while the vehicle is moving." Until courts or regulators say how the two fit together, keeping it in the trunk avoids the question.

Driving high

Under 625 ILCS 5/11-501, it's a DUI to drive or be in actual physical control of a vehicle while impaired by cannabis, or with a THC concentration, within 2 hours of driving, of 5 ng/mL or more in whole blood or 10 ng/mL or more in another bodily substance. Police can use roadside chemical tests and standardized field sobriety tests. A first DUI is a Class A misdemeanor; penalties go up from there.

Being legal to buy doesn't change any of that. If you're using, get a ride.

The smell of cannabis and car searches

The Illinois Supreme Court decided two cases in 2024. In People v. Redmond, the smell of burnt cannabis alone is not probable cause to search a car. In People v. Molina, the smell of raw cannabis alone is, because it suggests cannabis isn't in the odor-proof container the law requires. Another reason to keep it sealed.

Drive-thru and pickup

SB 3222 also lets dispensaries add drive-thru windows and pickup once IDFPR approves the setup. See which Central Illinois stores have one, and every way to buy.

Common questions

Can you have weed in your car in Illinois?

Does cannabis have to be in the trunk in Illinois?

Not always, since June 12, 2026. The Vehicle Code still says cannabis must be in a secured, sealed or resealable, odor-proof, child-resistant container that is 'inaccessible', but SB 3222 (Public Act 104-0463) added an exception: that inaccessibility rule doesn't apply to cannabis bought from a licensed dispensary and carried in a secured, sealed, odor-proof, child-resistant container in its original packaging. An opened package, or anything outside its original packaging, still needs to be out of reach. The trunk is still the safest place.

What is the THC limit for driving in Illinois?

It's a DUI to drive with, within 2 hours of driving, 5 nanograms or more of delta-9-THC per milliliter of whole blood or 10 nanograms or more per milliliter of another bodily substance. It's also a DUI to drive while impaired by cannabis at any level. A first DUI is a Class A misdemeanor.

Can police search my car if they smell cannabis in Illinois?

In People v. Redmond (Sept 19, 2024) the Illinois Supreme Court held that the smell of burnt cannabis alone is not enough for a warrantless car search. In People v. Molina (Dec 5, 2024) it held that the smell of raw cannabis alone is enough, because it suggests cannabis isn't in an odor-proof container as the law requires. A 2025 bill to end odor-based stops (SB 42) passed the Senate but stalled in the House.

Can a passenger smoke cannabis in a car in Illinois?

No. The Cannabis Regulation and Tax Act bans using cannabis in any motor vehicle, and passengers may only have cannabis in the passenger area in a sealed, odor-proof, child-resistant container. Breaking the Vehicle Code's container rules, or a driver using cannabis in the vehicle, is a Class A misdemeanor.

Do medical cannabis patients have a different DUI rule?

Partly. The 5 ng/mL blood rule does not apply to a registered medical patient with a valid card unless they are impaired by cannabis. Driving while impaired is still a DUI, and having a card is not a defense.

Sources

Checked Sep 25, 2026. Laws and store policies change; if something here looks out of date, tell us at hi@puffprice.com.

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