Ryan O'Neal's lawyer says his client is innocent -- and that drugs found at Ryan's Malibu home belong to someone else. "The drugs found were not his," attorney Mark Werksman told AP. "He would never use them."

Ryan and his son Redmond -- who is currently on probation in another drug case - were busted Wednesday after cops performed a routine probation search and allegedly found methamphetamine. The father-son duo were arrested and released after posting $10,000 bail. No charges have been filed.

"He has tried to lead a peaceful life," Werksman insisted. "He's acting and he's caring for his family and this is the last thing he ever wanted or expected."

Redmond, 23, is Ryan's son with actress Farrah Fawcett.