FILE - A Sunday, March 31, 2013 photo from files showing Canadian singer Justin Bieber performing on stage during the "I Believe Tour " in Berlin, Germany. Swedish police say they have found drugs on board a tour bus used by Canadian pop singer Justin Bieber. Police spokesman Lars Bystrom says a small amount of drugs and a stun gun were found when officers raided the empty bus parked under the Globen concert venue in Stockholm, where Bieber was performing Wednesday, April 24, 2013. (AP Photo/Gero Breloer)

Associated Press
FILE - A Sunday, March 31, 2013 photo from files showing Canadian singer Justin Bieber performing on stage during the "I Believe Tour " in Berlin, Germany. Swedish police say they have found drugs on board a tour bus used by Canadian pop singer Justin Bieber. Police spokesman Lars Bystrom says a small amount of drugs and a stun gun were found when officers raided the empty bus parked under the Globen concert venue in Stockholm, where Bieber was performing Wednesday, April 24, 2013. (AP Photo/Gero Breloer)
FILE - A Sunday, March 31, 2013 photo from files showing Canadian singer Justin Bieber performing on stage during the "I Believe Tour " in Berlin, Germany. Swedish police say they have found drugs on board a tour bus used by Canadian pop singer Justin Bieber. Police spokesman Lars Bystrom says a small amount of drugs and a stun gun were found when officers raided the empty bus parked under the Globen concert venue in Stockholm, where Bieber was performing Wednesday, April 24, 2013. (AP Photo/Gero Breloer)