Uh oh! At least he wasn't on the bus at the time.
According to TMZ:
"Police reportedly boarded the bus in Stockholm as the bus pulled up at the arena where Bieber was performing ... and found a "small amount" of what appeared to be pot.
A police spokesman told the Aftonbladet newspaper ... they first detected a "strong smell" of marijuana coming from the bus as they were controlling the huge crowd that had gathered outside Bieber's hotel.
The Swedish report says police also found a stun gun ... which requires a permit."
TMZ has learned that NO ONE will be charged in the incident since the tour bus was empty during the raid and that police have no idea who the drugs beloged to. AKA... Biebs gets a pass (see what I did there?)