Four 10-year-olds were caught buying and selling their grandparents' pot on a playground in Colorado this week. One young man made $11.

Just a few days late for Colorado's first fully legal 4/20, a ten-year-old boy was caught on Tuesday after successfully selling a bag of weed, stolen from his grandparents, to three other fourth-grade classmates on his school's playground. According to CNN, the classmates split the bag for $11 and when one of the students couldn't pay his share (typical 10-year-old), he instead offered a trade: his cut of the pot for one of his grandparents' edibles.

The selling child is reported to have taken a bite of the edible (a candy bar), but suffered no harmful effects. The group was busted when another student saw their dealings and told school officials.

In a letter that went home with students, the school district's safety director, John Gates, said, "We urge all parents, grandparents and anyone who cares for children to treat marijuana as you would prescription drugs, alcohol or even firearms. This drug is potentially lethal to children, and should always be kept under lock and key, away from young people."

On the bright side, at least all of these nice young children are visiting their grandparents.

[Image credit: AP]