"No one present at the deposition had the power of arrest," Goodwin wrote. Those who took Stover's deposition also told him he could take breaks at any time, "and the deposition took place at the mine academy, not a police station."
Witnesses testified last fall that Stover instructed mine guards to send out radio alerts whenever inspectors entered the property, which is illegal. Stover denied those claims during the interview.
Goodwin said the jury had "overwhelming evidence" to support its verdict.
Stover also argued that he was asked ambiguous questions, but Goodwin said the investigators' inquiries "were clear on their face, and were unmistakable given the context in which they were asked."
"His only argument here is he ordered the destruction of the mine records without criminal intent," Goodwin wrote. "At trial, when confronted with the question of why he did it, his only explanation was that the act was 'stupid.'"
Besides the circumstantial evidence, jurors also considered Stover's testimony.
Stover "put his own credibility directly at issue," Goodwin argued. "The jury was entitled not to believe him.
"Defendant denied, more than once, that he acted with any criminal intent. Any rational trier of act could find these denials are simply not credible," he wrote. "His concocted excuses for his actions were considered by the jury in this case and would support a similar guilty verdict by any other rational jury."
Only one other person has been criminally charged in the disaster so far.
Former superintendent Gary May pleaded guilty to conspiracy to defraud the federal government for his actions at the mine. He's cooperating with federal prosecutors in a continuing investigation and will be sentenced in October.