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TARRANT COUNTY, Texas - There is a new effort to put a teenage drunk driver behind bars.

Ethan Couch was the 16-year-old driver in a crash that killed four people this past summer: Brian Jennings, Hollie and Shelby Boyles, and Breanna Mitchell. Police said Couch's blood alcohol level was three times the legal limit. Couch was sentenced to 10 years probation, with no road for appeal, and must attend a private counseling center, to be paid for by his father.

The district attorney is now turning his attention to two teens that were severely injured in the crash.

Sergio Molina and Solimon Mohmand were riding in the back of Ethan Couch's truck the night he admits he drove drunk and caused the accident. Mohmand's body lies broken, with internal injuries. Molina now paralyzed; blinking is his only way to communicate.

Six months later, a juvenile district judge's sentence for Couch drew outrage across the nation.

Tarrant County prosecutors told CBS 11 in Fort Worth, Texas they could not find a legal reason to appeal the judge's decision. But now District Attorney Joe Shannon wants new trials for injuries Couch's passengers suffered.

"During his recent trial, the 16-year-old admitted his guilt in four cases of intoxication manslaughter and two cases of intoxication assault. There has been no verdict formally entered in the two intoxication assault cases. Every case deserves a verdict," Shannon said. "The District Attorney's Office is asking the court to incarcerate the teen on the two intoxication assault cases."

The maximum sentence Couch faces on those charges is three years behind bars.

We're also learning more about Couch's parents, both of whom have

long criminal records

. According to the Johnson County Sheriff's Office, Fred Couch was arrested for DWI in 1992, criminal mischief in 1994, and allegedly assaulting his wife in 1996. All told, Fred Couch has 22 separate incidents on his record.

Ethan Couch's mother, Tonya, was charged with reckless driving in 2003.

During the trial, Ethan Couch's attorneys argued the teen was not responsible for his actions because his parents were not involved and gave him everything he wanted. One defense psychologist called it "affluenza."

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