Like his world tour, the controversy surrounding Justin Bieber just keeps on rolling with seemingly no end in sight.

According to CBC, a bus on Justin Bieber's current world tour was stopped Sunday at the U.S./Canada border entering Detroit from Windsor crossing the Ambassador Bridge.

American border agents discovered marijuana on the bus which Bieber was not riding on. Kenneth Hammond, the chief officer and public affairs liaison for the U.S. Customs and Border Protection in Detroit,, said a small amount of marijuana was found as well as drug paraphernalia after sniffing dogs detected drugs.

The Detroit Free Press reported the bus driver was cited but the bus and its passengers on board were allowed to carry on their trip. Bieber's tour went on without a hitch Sunday night at Detroit's Joe Louis Arena. It's unknown if any of Bieber's touring group, dancers or road crew were riding the bus when it was stopped.

The incident follows a string of controversy in July where Bieber was shown on camera urinating in a mop bucket in New York City and spitting from a hotel balcony. Bieber made no mention of what happened at the border via Twitter.

Justin Bieber
Just talking about the last couple shows. Toronto and Detroit were real! Energy was next level . Thanks!

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  • Cara Delevingne

    Cara Delevingne has yet to speak about the snaps of her dropping a suspicious packet of white powder outside her home in front of the paps in May 2013.

  • Rihanna

    Rihanna denied claims she was taking something dodgy after she was pictured sitting on a man's shoulders with a mystery white powder on his head at Coachella. She called MTV "pathetic c*nts" over their claim.

  • Frankie Cocozza

    Frankie Cocozza was thrown off 'The X Factor' in 2011 after being overheard by a member of the show's production team bragging about taking cocaine. "I helped in showing a lot of young people out there that drugs f**k things up, no matter how dodgy it all was. Say no to drugs. Life's too short," he said afterwards.

  • Tulisa

    Tulisa was arrested on suspicion of supplying class A drugs, after an undercover reporter working for The Sun allegedly caught her on camera fixing up a drug deal. Her alleged dealer, Mike GLC, claimed the pair had been set up after they were released on bail.

  • Kerry Katona

    Kerry Katona has spoken openly about her use of cocaine while she was married to second husband Mark Croft, who sold a video of her snorting the drug to a newspaper in 2009. She later told the News Of The World: "I hated my life, I’d lie in bed for three days in a row doing cocaine with Mark. Our relationship was just about coke. Mostly we’d have three-day sessions and not eat."

  • Amanda Bynes

    "I only smoke tobacco, I don't drink or do drugs. I've never had a bong in my life!" tweeted Amanda Bynes. Shortly afterwards she was arrested after reportedly throwing a bong out of her New York apartment window.

  • Kate Moss

    Kate Moss hit out at reports she used to use heroin. "If I was anorexic or if I was on heroin, maybe I would have been a bit more ‘oh dear!' But I wasn’t any of those things that they were painting me to be," she wrote in her 2013 book. However, Kate faced allegations of cocaine use in 2005, when the Daily Mirror printed photos appearing to show her with the drug. Police dropped the charges for lack of evidence.

  • Richard Bacon

    Richard Bacon was fired from his role as a Blue Peter presenter in 1999 after using cocaine. "I have been stupid and regret making a silly mistake experimenting with drugs. But I have learned the lesson the hard way and I hope it serves as a lesson to lots of other young people. I would also like to apologise to all loyal Blue Peter viewers," he said at the time.

  • Pete Doherty

    Pete Doherty has been repeatedly arrested for drug offences, and even spent time in jail in 2010. "It was just a question of how quickly I can find a vein and then let's get on with it. It's poison but it's also medicine. When you're in that state, you can't function unless you have your fix. I am struggling, to be honest," he told the Guardian in 2012.

  • Daniella Westbrook

    Daniella Westbrook was asked to leave EastEnders twice over her off-screen antics. The star famously eroded away her septum due to her use of cocaine. She later revealed that she took drugs while she was giving birth to her son.: "I took drugs right up to the moment I delivered him, in the bathroom of the suite. Whilst in labour I asked them to leave the room," she told 'The Jeremy Kyle Show'.

  • Justin Bieber

    Justin Bieber took to Twitter to deny rumours that cannabis and a stun gun were allegedly found on his tour bus in 2013. "Some of the rumors about me....where do people even get this stuff. whatever...back to the music," he wrote.

  • Spencer Matthews

    Made In Chelsea's Spencer Matthews was reportedly captured on film snorting cocaine in 2012. “I can’t say too much about it because it’s an ongoing thing – they were just allegations,” he later told the Daily Star.

  • Matthew Perry

    "Mostly it was drinking, you know, and opiates," Matthew Perry told ABC of his addiction during the height of his 'Friends' fame. "I think I was pretty good at hiding it but, you know, eventually people were aware."

  • Macaulay Culkin

    Macaulay Culkin's reps strenuously denied claims that the actor was addicted to heroin in 2012. "Not only [is the story] categorically without merit, but it is also impossibly and ridiculously fictitious. We beseech the responsible media to consider the source and its reputation and to please not perpetuate this destructive and insulting story by pursuing it any further," they said.

  • Robbie Williams

    “At the time you don’t give a s*** if you pop your clogs. I must have been very, very close," Robbie Williams told The Sun of his 1990s drug addiction. "I would have carried on, to be honest. You get to the point that far into your addiction, you’re not bothered whether you live or die, because that’s where it takes you.”

  • Snoop Dogg

    Snoop Dogg was forbidden from returning to Norway in 2012, following an arrest at Kjevik airport, Kristiansand, for possession of marijuana.

  • Brian Harvey

    Brian Harvey was fired from boyband East 17 in 1997 after comments he made in the media, claiming he had taken 12 ecstasy tablets in one night and then driven. In 2002 he was also charged with possessing and supplying cocaine but was later cleared. "I have maintained my innocence for the last 12-months and still do today," he said after his acquittal.

  • Mary J Blige

    "When I got that Grammy I was high. Not at the Grammys I don't think. But I was drinking like a crazy person. Still sniffing cocaine going in," Mary J Blige told the Los Angeles Confidential of her 1995 Grammy win. "[Whitney Houston's] death is another reason I stopped. I really do think I'm done."

  • Angelina Jolie

    "I have done just about every drug possible: cocaine, ecstasy, LSD and, my favorite, heroin," Ange told The Mirror in 1996.

  • George Clooney

    "I didn't live my life in the right way for politics, you know. I fucked too many chicks and did too many drugs, and that's the truth. That's gonna be my campaign slogan: 'I drank the bong water,'" George told Newsweek in 2011.

  • Whoopi Goldberg

    <em>On smoking a joint to calm herself before winning her 1991 Oscar for "Ghost":</em> "Smoking cigarettes and pot every now and then are my habits. And so I thought, 'I've got to relax.' So I smoked this wonderful joint that was the last of my homegrown. And honey, when [Denzel Washington] said my name and I popped up, I thought, 'Oh, fuck.'"

  • Sienna Miller

    "I mean, I still love a waterfall or the odd hallucinogenic drug. I liked mushrooms, which were legal until a year or so ago. If I had a drug of choice, it would be magic mushrooms." [The Guardian, 2007]

  • Megan Fox

    "I’ve done drugs, and that’s how I know I don’t like them. Cocaine is back with a vengeance. Everyone in every club is doing drugs. A lot of people are on prescription drugs. Celebrities aren’t trying to hide it, except where people have camera phones. ... I wanted to try several things and make an informed decision, but I didn’t enjoy anything other than marijuana. I don’t even think of it as a drug -- it should be legalized. I know about five people who aren’t on drugs today, and I’m one of them." [Maxim, 2007]

  • Oprah Winfrey

    <em>On doing cocaine with her boyfriend in the '70s while working as an anchorwoman in Nashville:</em> "I did your drug. This is probably one of the hardest things I have ever said. ... I had a perfect, round, little Afro, I went to church on Sunday and I went to Wednesday prayer meetings when I could ... and I did drugs." ["The Oprah Winfrey Show," 1995]

  • Anthony Kiedis

    "I spent most of my life looking for the quick fix and the deep kick. I shot drugs under freeway off-ramps with Mexican gangbangers and in thousand-dollar-a-day hotel suites. Now I sip vitamin-infused water and seek out wild, as opposed to farm-raised, salmon." ["Scar Tissue," published 2005]

  • Drew Barrymore

    "When I was 10 ½, I was sitting in a room with a group of young adults who were smoking pot. I wanted to try some, and they said, 'Sure. Isn't it cute, a little girl getting stoned?' Eventually that got boring, and my addict mind told me, 'Well, if smoking pot is cute, it'll also be cute to get the heavier stuff like cocaine.' It was gradual. What I did kept getting worse and worse, and I didn't care what anybody else thought." [People, 1989]

  • Nicole Richie

    "I kind of took matters into my own hands and was creating drama in a very dangerous way. I think I was just bored, and I had seen everything. Especially when you're young, you just want more. ... At 18 I had just been doing a lot of cocaine." [People, 2007]

  • George Michael

    "[Marijuana] keeps me sane and happy. I could write without it if I was sane and happy. ... This is the only kind of drug I ever thought worth taking." [ITV's "South Bank Show," 2008]

  • Morgan Freeman

    "Never give up the ganja." [The Guardian, 2003]

  • Kirsten Dunst

    "I've never been a major smoker, but I think America's view on weed is ridiculous. I mean, are you kidding me? If everyone smoked weed, the world would be a better place." [The Daily Mail, 2007]

  • Elton John

    "I was consumed by cocaine, booze and who knows what else. I apparently never got the memo that the Me generation had ended." ["Love Is the Cure: On Life, Loss and the End of AIDS," published 2012]

  • Dennis Quaid

    “Cocaine was even in the budgets of movies, thinly disguised. It was petty cash, you know? It was supplied, basically, on movie sets because everyone was doing it. People would make deals. Instead of having a cocktail, you’d have a line." [Newsweek, 2011]

  • Nicolas Cage

    "I had a bag of mushrooms in my refrigerator. My cat used to sneak into the refrigerator and eat them. ... He ate them voraciously; it was like catnip to him. So I thought, 'What the heck, I better do it with him.' I remember lying on my bed for hours and Lewis was on the desk across my bed for hours, and we just stared at each other -- not moving, just staring at each other, and I had no doubt that he was my brother. But having said that, I don't do that anymore. And you know what? Later in life, when I was completely not doing any of that, I know he said 'Hi' to me." ["Late Show With David Letterman," 2010]

  • Johnny Depp

    "I don't trust anyone who hasn't been self-destructive in some way. Who hasn't gone through some sort of bout of self-loathing. You've got to bang yourself around a bit to know yourself." [GQ, 2011]

  • Frank Ocean

    "hi guys, i smoke pot. ok guys, bye." [Twitter, 2013]

  • Fergie

    “I got into a scene. I started going out and taking ecstasy. From ecstasy, it went to crystal meth. With any drugs, everything is great at the beginning, and then slowly your life starts to spiral down. [I was] 90 pounds at one point.” ["Oprah's Next Chapter," 2012]