The occasional actor and DJ had faced 10 years in prison for pleading guilty to selling bulk quantities of methamphetamine and cocaine at Manhattan's upscale Hotel Gansevoort in 2009. Berman said he wasn't convinced that Cameron Douglas would stay away from drugs when he pleaded guilty in January, and called the five-year prison sentence the 31-year-old's "last chance to make it."
Cameron Douglas wore a scowl for much of the proceeding, according to the New York Post, which quoted the Hollywood heir as promising this time would be different.
"I made a lot of mistakes," he said. "I believe, your honor, that things will be different this time because I feel I have the full support of my family and parents. "
But Berman had none of it.
"We all need to get over the theme that Cameron Douglas is a victim," he was quoted as saying.
In a bid to keep his son from a long stint in jail, 65-year-old "Wall Street" actor Michael Douglas hand-wrote an impassioned, five-page letter to Berman, which was made public Monday. In his letter, Michael Douglas referred to his family's history of drug abuse.
"Dear Judge Berman," he wrote, "I don't want to burden you with a litany of my son, Cameron's rehab history, beginning at 13. He's an adult and responsible for his own life. We do know, however, that genes, family, and peer pressure are all a strong influence on a substance abuser.
"For the past eight months, I have cherished my two hr. a week in person conversation with Cameron at the MCC [Metropolitan Correctional Center]. He's sober!," he continued. "I get to witness the wonderful young man he can be. He maintains his spirit, blames no one but himself, and recognizes his criminal activity began with his heroin use."
But Berman called the letters "naive" and "somewhat misguided."
According to the Post, Michael Douglas was overheard telling his lawyer the sentence was "fair," while ex-wife Diandra cried and dabbed her eyes throughout the hearing.
Michael Douglas suggested that his family's fame -- he's won an Oscar; his father is the veteran actor and "Spartacus" star Kirk Douglas -- could be to blame for his son's dependence on drugs.
"I have some idea of the pressure of finding your own identity with a famous father," he wrote. "I'm not sure I can comprehend it with two generations to deal with."
On top of that, he cited Cameron Douglas' upbringing as a source of problems.
"Cameron grew up a single child in a bad marriage," Michael Douglas wrote.
Kirk Douglas, and Michael Douglas' actress wife, Catherine Zeta-Jones, also submitted letters to the judge. Zeta-Jones called Cameron a "caring, considerate, worthy human being" despite his heroin addiction but conceded that he ought to make amends for his crime, writing that she hopes he ends up in a facility that "will help rehabilitate him."
In his letter, Kirk Douglas, 93, asked the judge to spare his grandson from years in prison, saying he hopes to see him rebound from his troubles "before I die.
"I'm convinced Cameron could be a fine actor," Kirk Douglas wrote. "I hope I can see that happen before I die. I love Cameron."