As used in this subchapter, unless the context otherwise requires:
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(1) “Court” means the circuit court for the judicial district of this state in which the proceeding is or may be held;
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(2) “Grand jury” means any grand jury impaneled in accordance with the laws of this state;
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(3) “Prosecuting attorney” means the prosecuting attorney for the judicial district of this state in which the proceeding is or may be held and includes his duly appointed deputies.