Where you can't use cannabis in Illinois, and what the law says about cars

This article is general information, not legal advice. Laws change and facts differ; for your situation, talk to a lawyer licensed in Illinois.

Adults 21 and older in Illinois may possess cannabis within the state's limits (our explainer). But 410 ILCS 705/10-35 spells out conduct the Cannabis Regulation and Tax Act doesn't permit. For that conduct, civil, criminal or other penalties can still apply.

Places where use isn't protected

The act doesn't permit using cannabis:

• on a school bus, or on the grounds of a preschool, primary or secondary school, with narrow exceptions for medical patients and caregivers;
• in any correctional facility;
• in any motor vehicle;
• in a private home used at any time for licensed child care or similar social-service care;
• in any public place; or
• knowingly in close physical proximity to anyone under 21 who isn't a registered medical cannabis patient.

Smoking is also barred anywhere the Smoke Free Illinois Act bans smoking.

What counts as a "public place"

The statute defines a public place as anywhere a person "could reasonably be expected to be observed by others." That includes every part of a building owned or leased, in whole or in part, by the state or a local government. It also covers all areas of parks, recreation areas, wildlife areas and playgrounds that government owns, leases or manages. A private home isn't a public place unless it's used for licensed child care, foster care or similar care.

Cars and other vehicles

Section 10-35(a)(2)(D) says possession in a vehicle that isn't open to the public must be in a "reasonably secured, sealed or resealable container" that is reasonably out of reach while the vehicle moves. IDFPR's purchaser FAQ uses different wording. It says cannabis in an operating vehicle must be in a "sealed, odor-proof, child-resistant container," and that any other container is a Class A misdemeanor. That language appears to come from the Illinois Vehicle Code, which we haven't reviewed for this story.

Section 10-35(b) says nothing in the act prevents an arrest or prosecution for reckless driving or driving under the influence of cannabis when probable cause exists, and it names watercraft and snowmobiles as well. Separately, section 10-35(a)(5) says the act doesn't permit operating or being in actual physical control of a motor vehicle, aircraft, watercraft or snowmobile while using or under the influence of cannabis in violation of the Illinois Vehicle Code, the Boat Registration and Safety Act or the Snowmobile Registration and Safety Act. We have not reviewed those statutes, so we don't state impairment thresholds.

Work, duty and private property

The act doesn't protect cannabis use while on duty by law enforcement, corrections and probation officers or firefighters, or by school bus permit holders or commercial drivers. It doesn't cover any task where being under the influence would amount to negligence or professional misconduct. Private businesses may ban use on their property, parking areas included.

What about lounges?

According to IDFPR's FAQ, the act lets local governments authorize on-site consumption lounges, and IDFPR doesn't license them. The authorization decision is up to local governments, so we can't say whether any exist where you live.

Sources

• 410 ILCS 705/10-35, limitations and penalties
• IDFPR, purchaser FAQ (PDF)

More state rules: see our Illinois rules tracker.

Related: our rules in every state we track.

Drafted with AI assistance from primary sources and reviewed by Monsaur Othman before publication. Read how we use AI, our editorial policy and our corrections policy.

For adults 21+. News and education only. General information, not legal advice. Nothing here is a health claim or an offer to sell.