Deputies arrested the pair about 7:30 a.m. after going to the 21000 block of Pacific Coast Highway to conduct a "compliance check" on Redmond O'Neal, 23, who was on probation on a drug-related charge, said Steve Whitmore of the Los Angeles County Sheriff's Department. The compliance check began about 5:30 a.m.
Redmond O'Neal and his father, 67, were booked on suspicion of possession of a controlled substance, and each was held on $10,000 bail, Whitmore said. Both were in the process of posting bail late this morning.
Whitmore could not confirm a report on the celebrity news Web site TMZ.com that the drug involved in the case was methamphetamine. The Web site reported that investigators found Redmond O'Neal in possession of drugs and found a vial in Ryan O'Neal's room.
Redmond O'Neal, whose mother is Farrah Fawcett, pleaded guilty in June to one felony count each of possession of heroin and methamphetamine and one misdemeanor count of driving under the influence of drugs. He was placed on three years probation and was due back in court on that case for a progress report hearing on Oct. 31.
Ryan O'Neal was arrested following a fight with his then-42-year-old son Griffin. O'Neal, who fired a shot during the altercation, was booked on suspicion of assault with a deadly weapon and negligent discharge of a firearm.
Prosecutors, however, declined to file any charges, concluding there was "insufficient evidence to prove this case to a jury beyond a reasonable doubt."