MIAMI (AP) - Pot - and an anti-anxiety drug. Authorities say that's what they found in Justin Bieber's system after he was busted last week in South Florida. A preliminary toxicology report says besides the weed and the Xanax, there were no other illicit drugs in The Beeb's system. Bieber was arrested last week on charges of DUI, resisting arrest and having an expired driver's license. Authorities say he was drag racing - but he wasn't charged with that. Bieber has pleaded not guilty - but did tell police he had been smoking pot and had taken a prescription drug.