with the public speech center stage at the emmys by michael douglas, saying he wants to see his son. Cameron douglas is behind bars for dealing drugs. And michael douglas used the emmys speech to... See More
with the public speech center stage at the emmys by michael douglas, saying he wants to see his son. Cameron douglas is behind bars for dealing drugs. And michael douglas used the emmys speech to speak out against the prison system. Reporter: From one of the funniest acceptance speeches on stage. To one of the most personal moments backstage. Michael douglas, fresh off his best lead actor emmy win for playing liberace, made a frustrated plea to see his son, cameron, serving a 9 1/2-year federal prison sentence for drugs. Obviously, at first, I was certainly disappointed with my son. But I reached a point, now, I'm very, very disappointed with the system. Reporter: At 34, cameron is douglas' oldest child and has a long-running battle with addiction. He's serving time in maryland for distribution and procession. And he pleaded guilty to possessing drugs while behind bars. Prison officials would not say if cameron is in solitary confinement and not allowed family businesses. But his famous father would not hold back. Spent almost two years in solitary confinement. And right now, I'm being told i cannot see him for two years. It's over a year now. And I'm questioning the system. Reporter: Hollywood watchers call it classic michael douglas. He really does want to see his son. She's somebody who is not shy about making known what he wants. And hopefully pursuing that. Reporter: It's not the first time the actor has talked publicly about what he considers to be an excessive sentence for a nonviolent drug offender. He talked openly about it to elizabeth vargas about it earlier this year. You said recently in an interview you thought he was getting punished because of his last name. He received is longest sentence in the history of the american penal system for having drugs in prison. And his case, it was a minor slip. So, we're trying to understand it, how they justified it. Reporter: One father, hoping to make a difference. And hoping that I'll be able and they'll allow many e to see him soon. Reporter: A father with a very public stage. For "good morning america," cecilia vega, abc news, los angeles. I do wish him the best. Cameron douglas, due to be released from prison in 2018.
This transcript has been automatically generated and may not be 100% accurate.