Defense lawyers have argued that material in police reports and in LaDue's journal, which investigators say laid out plans for the attack in remarkable detail, would prejudice potential jurors.
LaDue's father, David LaDue, passionately defended his son in an interview with NBC station KARE of Minneapolis after the probable cause hearing, saying the teen wouldn't have gone through with the plot, which he called a cry for help.
"All they know about him is the story he shared when they walked up on him in the storage locker, and that's all they know. And they fully believed that he was going to carry this out," the elder LaDue said.
"I think he would have continued to delay or find a reason. He didn't seem to behave like somebody who wanted to continue on with this."
David LaDue said he believed his son needed mental health care, not punishment, and that his detention pending trial could worsen the teen's condition.
"He's with a lot of convicted hard guys, and… I think it's a really strange experience for him," David LaDue said.
Judge Gerald Wolf scheduled a hearing for July 30 to determine whether LaDue would be tried as an adult or as a juvenile.