EXCLUSIVE: **NO USA TV AND NO USA WEB** On the way between Michigan and Canada singer Rihanna's tour buses were stopped at the border. According to TMZ.com this was due to the smell of marijuana. Rihanna wasn't on board the buses but authorities did find a small amount of marijuana. A bus to bus search was initiated from the authorities. There was 10 buses total. Drug sniffing dogs headed to one passenger that was cited for a civil penalty according to TMZ.com Pictured: Rihanna's tour buses at the border