(CNN) - Pot was found on one of the buses that's touring with singer Rihanna.
She wasn't on the bus at the time, but it was one of 10 in her entourage going from Canada to Detroit.
U.S. border patrol smelled marijuana and sent a drug-sniffing dog on board.
The person allegedly carrying the drug and the bus were allowed to continue on, but both got citations.
No word from Rihanna on the incident.