The jingle of the ice cream truck also meant pot sales on wheels, and at least one young customer figured that was not cool.

Police say an elementary school student tipped them off to an ice cream truck driver who was apparently selling $5 and $10 bags of marijuana from the truck. Most customers were in the third, fourth, and fifth grades.

"It's a scary thought, but that's the info we received," Mission police Chief Leo Longoria said.

The driver, a Mexican national, was arrested Thursday. Police on Friday were withholding his identity pending an expected arraignment on drug possession charges.

While police did not witness any sales, they did find packets of marijuana alongside the more traditional frozen treats.

News video showed the driver may have been doing some subtle advertising. While the outside of the truck was festooned with pictures of ice cream, pendants in the shape of marijuana leaves dangled inside the truck.