As Rihanna's tour buses were at the border of Canada and Michigan, cops pulled the buses over, all ten of them. We all know Rihanna likes to puff here and there and guess what? Authorities were forced to check buses once they smelled weed one of the buses. Dogs were brought in to sniff out the buses and a small amount of weed was even found on someone. Luckily Rihanna wasn't on any of these buses when this incident occured. Hopefully this doesn't cause a set back or any problems to the tour.