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Redmond O'Neal is doing well with his "aggressive drug and alcohol rehabilitation program," Commissioner Jane Godfrey told the Los Angeles Superior Court during a progress report hearing on Thursday.

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"He is responding very, very well," she said.

The 24-year-old son of Farrah Fawcett -- who is currently battling cancer -- did not appear at the hearing, but he will continue his in-custody treatment program.

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O'Neal is still in the "trial" phase, Godfrey said.

The drug program -- run by Impact, an organization based in Pasadena -- could remove him from probation and wipe his record clean of previous drug convictions if he completes their mandates successfully.

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His next hearing -- which he is not required to attend -- is scheduled for June 25.