They were arrested in September when Los Angeles sheriff's deputies did a routine parole check on Redmond O'Neal, who was staying at his father's Malibu home.
O'Neal, 67, was nominated for a best actor Academy Award for 1970's "Love Story." Redmond, 23, is his son from a relationship with Farrah Fawcett.
The actor's attorney has denied the drugs belonged to his client.
Slideshow archive | Local events | Contests | Headlines at a glance