Yes. Illinois treats cannabis like alcohol for vehicle transport. Under the Cannabis Regulation and Tax Act, any cannabis in a vehicle must be in a sealed, odor-proof, child-resistant container inaccessible to the driver and passengers while the vehicle is on a roadway. Violation is a Class A misdemeanor and provides probable cause for a DUI investigation. The chicagoduilawyer.net brand emphasizes this to every client: the container rule is often what escalates a routine stop into a full DUI arrest. An officer who smells cannabis or sees a partially opened package now has grounds for expanded search and field sobriety testing.
