CHARLESTON, Ill. (AP) — An Illinois teenager accused in a high school shooting that injured one student in September suffers from a defiance disorder and other conditions for which he can't be treated at the state's Juvenile Justice Department, a psychiatrist has found.

A judge approved an evaluation by a state agency for the 15-year-old, the Mattoon Journal-Gazette and (Charleston) Times-Courier reported. But Judge Matt Sullivan said the teen will remain in the custody of the Juvenile Justice Department and won't be moved to the Department of Human Services for possible placement in a treatment facility.

The teen is charged with aggravated battery with a firearm in the Sept. 20 shooting at Mattoon High School. Prosecutors have said teacher Angela McQueen grabbed the boy's arm as he fired at a girl. The gunshot missed the girl but hit another student in the upper chest. More shots were fired into the cafeteria ceiling before McQueen subdued the boy.

Psychiatrist Lawrence Jeckel testified that the boy was motivated in part by "perceived bullying" but also acts as a bully himself. He said addressing teen's conditions could only take place at a secured facility with "intense residential treatment." He said treatment could take four to five years.

Coles County State's Attorney Brian Bower filed a motion Thursday requesting that the teen be eligible for a longer sentence than what's possible for a juvenile offense if he's convicted. A hearing for the motion is scheduled for March 29.

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Information from: Mattoon Journal-Gazette, http://www.jg-tc.com