Renfro was first in court last month, when he initially pleaded not guilty to attempted possession of heroin.
The 23-year-old actor was arrested in December during a sting operation conducted by the Los Angeles Police Department (LAPD) in downtown Los Angeles.
The Jacket star was given three years probation and must continue a drug rehabilitation program.
Renfro was also arrested in 1998 for possessing cocaine and cannabis, but made a plea deal which kept him out of prison.
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