Redmond O'Neal was transferred to a new L.A. County Sheriff Department jail on Wednesday afternoon to begin his "aggressive drug and alcohol rehabilitation program," spokesman Steve Whitmore tells

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The 24-year-old son of Farrah Fawcett -- who is currently battling cancer -- moved from his housing at the Twin Towers jail in downtown L.A. to the Pitchess Detention Center just north of Santa Clarita in Castaic, California.   "It is a jail," Whitmore tells Us. "We have several jails in the south facility -- he is in a compound area of it."

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O'Neal was ordered to complete a year-long rehabilitation program at his sentencing for probation violation and felony drug possession.

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.

See photos of today's top news stories.   The supervised drug court program involves three major phases, which includes group counseling, frequent drug-testing and court appearances as well as a 12-step program. It also requires O'Neal to obtain a job or receive schooling that would lead to employment.

"This is an opportunity to change your life," Prosecuting Attorney Tony Estradas said in court in April. "Our goal is for you to enjoy a long, healthy life that is free from addiction."