Ryan O'Neal has been arrested on suspicion of possessing methamphetamine.
Police found the drug Wednesday at the actor's Malibu home during a routine check connected with his 23-year-old son Redmond, who is on probation for three years after admitting driving under the influence and possession of heroin and methamphetamine, known as crystal meth, in June.
Los Angeles County Sheriff's spokesman Steve Whitmore said: "Deputies were doing a routine sweep to make sure Redmond was adhering to his probation."
"Upon searching the premises, the younger O'Neal was found in possession of narcotics. Later, a vial of drugs were found in the elder O'Neal's bedroom. We believe the drugs found were methamphetamines."
Both men were released after posting $10,000 bail and neither Ryan nor Redmond - whose mother is Farrah Fawcett, 61 - appeared under the influence of drugs, the sheriff said.
The 67-year-old "Love Story" actor was arrested last year on suspicion of assault with a deadly weapon and negligent discharge of a firearm after firing a gunshot during an argument with another son, Griffin, 43.
Ryan said he fired a warning shot just to scare his son. The dispute started after Redmond had been allegedly tied to a staircase by Griffin - his half-brother - to prevent him going out to buy drugs.
Charges were never filed for the incident.
Ryan's daughter, Tatum O'Neal, 44, a former child star, pleaded guilty in July to disorderly conduct stemming from a drug arrest in June.
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