Alert the drug slightly flavored sugar sniffing dogs... there's a whole dealer network for this. I remember when school clubs could sell candy openly to fund the clubs. German Club was worst. I swear the gummy bears we sold were 50% heroin from the way people reacted when we ran out.
They recently took soda pop machines out of my son's high school. Which opened up a black market of students selling cans of soda pop. At high prices. I kid you not.
One of the soda pop "dealers" is a friend of my sons, and is often over to our house. Whenever he comes over, I ask him how business is. Lol.