WEST HOLLYWOOD, Calif. — Actor Robert Downey Jr. thanked authorities Monday for arresting his 20-year-old son on suspicion of cocaine possession and said the family was determined to get him the help he needs.

Indio Falconer Downey was taken into custody on Sunday afternoon after a car he was riding in was pulled over in West Hollywood, authorities said.

“Unfortunately, there’s a genetic component to addiction and Indio has likely inherited it,” Robert Downey Jr., who had a series of high-profile drug-related arrests in the late 1990s, said in a statement