Hear From Teen Who Used 'Affluenza' as a Drunken-Driving Defense

Ethan Couch lists, in a court deposition, the drugs he has taken and what he recalls from the accident that killed four people.
3:54 | 10/16/15

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Transcript for Hear From Teen Who Used 'Affluenza' as a Drunken-Driving Defense
Now to a case of crime and privilege. The Texas teen sentenced to probation after he killed four bystanders in a drunken driving crash. His defense, he was raised too spoiled to know right from wrong. This morning, we are hearing from him and his parents in depositions obtained exclusively by ABC news, Matt Gutman is here with that. Good morning, Matt. Reporter: Good morning, robin. Those video depositions take us into this utterly dysfunctional family with all the ingredients of for a tragedy. The parents with a history of never saying no to their son, giving him everything but discipline. His own house to stay in, access to booze and a souped up truck that became a weapon of mass destruction leading to a terrible case of what they called affluenza. It was the defense that outraged the nation. Affluenza. The lawyer told judge gene Boyd he was so rich he didn't know right from wrong. Reporter: Lawyers telling a Texas court that 16-year-old Ethan couch was too spoiled to go to prison after he got drunk, piled seven other friends into his father's souped up pickup and plowed into a disabled car instantly killing four people. There's four or five kids laying in ditches and street. Are you with the accident right now? Oh, lord, oh, yes, there's another child in the ditch. Oh, my god. Reporter: 11 others injured. His legal team said in his sentencing Ethan would be better served in easier rehab than doing hard time. Couch pleaded guilty to four counts of intoxication, manslaughter but was sentenced to ten years probation and rehab. Ethan learned you should be able to do what you want when you want to do it. I think that was the message generally. Reporter: All the victims' family eventually settled their lawsuits against the couches but one little Lucas Mcconnell, one of the injured wanted justice. I feel like it needs to be done. Why? Because I haven't seen any punishment. Reporter: His lawyers forcing the couches to talk for the first time in these depositions obtained exclusively by ABC news. When is the last time you recall disciplining Ethan for anything? I don't remember. Reporter: The millionaire's son lived alone in this 4,000 square foot house with a pool and a wet bar. Was there always alcohol then when you were at the location? Not always, no. Reporter: Most of the time? Most of the time, yes. Reporter: Ethan rattles off a list of drugs shocking for anyone, much less a 16-year-old. Taken valium, hydrocodone, marijuana, cocaine, xanax, I mean, I tried ecstasy once. Reporter: Ethan revealing how little he remembers about that faithful night behind the wheel. Do you remember pulling out of the driveway? Not really. What's the next thing you recall? Waking up handcuffed to the hospital bed. Reporter: So how drunk was he? Blitzed. He had three times the legal limit for an adult hours after the crash. Now, Ethan never had to appear before a civil jury because that last family ended up settling with the couches, again, his money bought him good fortune, but we spent more than a week staking out the family and Ethan in Texas just hoping to talk to him and in our "20/20" you can see what happened when I tried to ask him a couple of questions. Try being the operative -- I'm sure many at home like we are shaking their heads and saying, how does this teach him -- the whole point is no one ever taught him a lesson then you -- ? One more time. One more time. And perhaps what's most upsetting about this, Ethan has never had to apologize. No one from his family has ever apologized for killing those four people. We will be watching tonight. Absolutely. That's unbelievable. Thanks for bringing that. That "20/20" airs at 10 P.M. On ABC. Coming up, Donald Trump, his

This transcript has been automatically generated and may not be 100% accurate.

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