The Illinois Supreme Court ruled that the odor of burnt marijuana alone does not provide law enforcement with probable cause to conduct a warrantless search of a vehicle. This unanimous decision stems from a 2020 traffic stop involving Ryan Redmond, where police found a small amount of cannabis in his car after claiming to smell burnt marijuana. The court emphasized that changes in cannabis laws, particularly the legalization of possession in 2019, mean that the smell of burnt cannabis is not sufficient evidence of a crime. Justice P. Scott Neville Jr. noted that without additional suspicious circumstances, such as visible evidence or signs of impairment, the search was unjustified. The ruling reinforces the idea that cannabis should be treated similarly to alcohol regarding legal possession but restricted use. This decision aligns with previous lower court rulings and addresses the evolving landscape of cannabis legislation in Illinois.