Garrison pleaded guilty in May to vehicular manslaughter without gross negligence and two alcohol-related charges in an accident Dec. 2 that killed a 17-year-old boy and injured a 15-year-old girl.
"We don't have all the information," Superior Court Judge Eldon Fox said during the hearing Thursday when remanding Garrison to the Department of Corrections "for diagnostics" to determine whether he would be a good candidate for probation. The request was made by Garrison's attorneys, People magazine reported.
During the hearing, members of the victims' families told the judge of the impact Garrison's actions had on their lives. Several of Garrison's friends also spoke, saying that the events of the night of the accident were not indicative of his true character.
"This is an out-of-body experience for me," Garrison told Fox. "I'm reminded of that night every day and I think about the bad decision I made. I am so sorry."
He could be sentenced to a maximum of 80 months in jail.
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