Rihanna's tour buses were stopped by law enforcement while she and her entourage were on the road for her "Diamonds" tour.

TMZ reports that while at the border between Michigan and Canada, Rihanna’s 10 tour buses were ordered to pull over after authorities smelled marijuana on one of them.

Drug-sniffing dogs were then brought onto the rest of the buses, and one of the dogs smelled weed. A passenger was charged with a civil penalty after authorities found a small amount on his person.

Rihanna was not on any of the tour buses at the time of the incident.

Meanwhile, Rihanna is set to release a documentary about her "777" tour.

The film airs on Fox (check your local listings for channel) May 6 at 8 p.m. (8-9 p.m. EDT/PDT) and will take a look at the singer’s chaotic worldwide tour.

According to a statement released by Fox, the film "gives viewers a behind-the-scenes look at Rihanna's unprecendented globe-trotting concert tour ... from the sound of popping champagne corks on the plane, to the backstage chaos, to the singer's special worldwide appearances." 

In November, Rihanna kicked off her "777" tour to promote her latest album, “Unapologetic,” heading to seven countries in seven days.

She boarded a private Boeing 777, the world’s largest twin-jet, along with 150 journalists and a select number of fans. Her first stop was Mexico City, from there she continued to Toronto, Stockholm, Paris, Berlin, London, and lastly, New York.

"I am so excited about the 777 Tour," Rihanna said on her official website. "We are turning this jumbo jet into our tour bus. We're practically living on this thing for a week: sleeping, partying, all together. Me, my fans, the press. ... it's going to be a wild ride. I wanted it to be a rock n' roll adventure, and I think when it's over it will be the coolest thing I've ever done. I'm that excited about it."

Her seventh album in seven years, “Unapologetic,” was released on Nov. 19 and topped music charts around the world.