During the hearing, the boy told Kirby he brought the knife to school after another student tried to pick a fight with him and tripped him in the hall.
He will remain on house arrest while awaiting sentencing on the illegal conveyance of weapons into a school safety zone charge.
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He is serving a 45-day expulsion and attending through a program at the juvenile court complex in Lebanon.
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School officials reported finding multiple knives after students reported that they had either seen or heard about the knives.
No one was injured.