KXAS reported that he also had marijuana and Valium in his system when he hit a group of people who were helping a disabled driver on the side of a road.
Police said that Couch had stolen beer from a store near the crash, KXAS reported.
The judge in the case sentenced Couch to 10 years probation and rehab, USA Today reported.
Couch, along with his mother, went to Mexico after his conviction, KDFW reported.
Once returned to the United States, Couch was sentenced to two years behind bars for his probation violation, Fox News reported.
Couch, who is now 20, was released Monday morning, but will have to wear a GPS ankle monitor and abide by a 9 p.m. curfew, KXAS reported.
Couch's mother, Tonya, was also charged with hindering apprehension of a felon and money laundering when she allegedly helped her son go to Mexico. She was returned to jail last week after failing a drug test, KXAS reported.