Orland Park police said the 57-year-old woman was cleaning Ajay Sundar's home after a June party when she ate a brownie sitting on top of a cabinet, Chicago Sun-Times Media reported.
Sundar, 23, called 911 after the woman complained of feeling dizzy and nauseous.
The paramedics informed police the woman said the brownie she ate might have smelled like marijuana.
Sundar, whose parents were out of the country, said a friend who attended the party, Jibril Ghadban, 22, left the brownie.
Ghadban led officers to a trash can with three containers of pot brownies.