FLORENCE, S.C. – A South Carolina teen accused of plotting to blow up his high school may have to undergo a psychological exam.

Prosecutors plan to argue in federal court Tuesday that 18-year-old Ryan Schallenberger (SHALL'-ehn-burger) should be checked for mental problems that could prevent him from helping his lawyers defend him.

Schallenberger was arrested April 19. Authorities say he bought materials to make several bombs and had written a journal detailing his plans to attack Chesterfield High School.

The teen faces several state and federal charges, including attempting to use a weapon of mass destruction. That charge carries a possible life sentence if he is convicted.