Prosecutors have said the 17-year-old told several students about his plans to shoot up South Portland High School and asked at least one other student to help.
A Cumberland County judge decided the teenager would be tried in the juvenile system, rather than adult criminal court, following two-days of testimony.
Maine's juvenile justice system defaults to privacy, but a South Portland case has frustrated prosecutors, who say the community has a right to know the threats.
The teenager accused of trying to recruit another person to commit murder at South Portland High School last fall will be released on house arrest Thursday after a judge found there was limited evidence that he poses a threat to others.
Tristan Hamilton, who has been charged with trying to recruit another person to commit murder at South Portland High School last fall, was released on house arrest Thursday after a judge found there was limited evidence that he poses a threat to others.