If ever there was a more appropriate cast member for Dr. Drew's Celebrity Rehab, it's got to be fallen teen idol Leif Garrett. The 48-year-old has-been was busted at the Metrolink station in Los Angeles for possession of a controlled substance - namely, black tar heroin found in his shoe. And this isn't the first rodeo for the former cast member of Ty Murray's Celebrity Bull Riding Challenge. In 2006, he was also busted on the Metro Red Line after being snagged riding without a ticket. During that incident, he was popped with both heroin and Quaaludes on him. He was sentenced to 90 days in jail and three years' probation. He was also arrested for possession in 1996 and 2005. Ironically, Garrett has become a fixture on Tru TV's The Smoking Gun Presents: World's Dumbest... Maybe they can feature him on the World's Dumbest Metro Riders segment. Next time, maybe Garrett will opt for the bus.