The Wisconsin Department of Justice has issued its argument asking the United States Supreme Court to deny Brendan Dassey's request for a hearing before the highest court in the country.
The DOJ's brief, filed on May 10, argues that investigators used proper techniques to interrogate Dassey following the 2005 murder of Teresa Halbach.
The brief says "The Wisconsin Court of Appeals correctly articulated this Court's totality-of-the-circumstances stands for voluntariness and reasonably applied that standard to the facts."
Dassey is appealing his conviction in the murder of Teresa Halbach in Manitowoc County. It's a case that has been ongoing since Halbach's disappearance in October, 2005.
Dassey and his uncle Steven Avery are serving life sentences in prison for her murder.
Back in February, attorneys filed a petition for the high court to review a federal appeals court decision which upheld Dassey's conviction.
A lower court magistrate had ruled Dassey's confession was coerced and he should be freed.
"They began by asking Petitioner's mother for permission to talk to him and by reading him his Miranda Rights," reads the state's brief. "Throughout the three-hour, noncustodial interview, investigators used only standard techniques such as adopting a sympathetic tone, encouraging honesty, and challenging his story when they believed he was lying."
It isn't known if the U.S. Supreme Court would consider his case.