what is the trouble he faced during his career?
Was arrested numerous times on charges related to drugs including cocaine, heroin, and marijuana
Robert Downey Jr.
was arrested numerous times on charges related to drugs including cocaine, heroin, and marijuana and went through drug treatment programs unsuccessfully, 
who played the prime minister in love actually Hugh Grant who is this person? An English actor and film producer. how did he start his career in acting? He made his debut in the Oxford-financed film "Privileged" does his first film stage comedy work? Yes did he have other jobs? Yes, he worked as an assistant groundsman, tutoring, writing comedy sketches for TV shows, and worked to write and produce radio commercials who are other artists he has worked with? Mel Gibson, Anthony Hopkins, Robert Downey Jr. who is the third mentioned person? He is an American actor and producer.
wiki:5321517
Robert Downey Jr. [SEP] 1996–2001: Career troubles
From 1996 through 2001, Downey was arrested numerous times on charges related to drugs including cocaine, heroin, and marijuana and went through drug treatment programs unsuccessfully, explaining in 1999 to a judge: "It's like I have a shotgun in my mouth, and I've got my finger on the trigger, and I like the taste of the gun metal." He explained his relapses by claiming to have been addicted to drugs since the age of eight, due to the fact that his father, also an addict previously, had been giving them to him. In April 1996, Downey was arrested for possession of heroin, cocaine, and an unloaded .357 Magnum handgun while he was speeding down Sunset Boulevard.