The custodian who threatened to blow up Warren County High School in April has waived her right to a preliminary hearing and has been bound to the grand jury.The defendant, Marlene Madewell, has waived her hearing before General Sessions Judge Bill Locke on the charge of filing a false report. She remains free on bond awaiting trial and is being represented by local attorney Dan Bryant. She no longer works for the school system, losing her job of 12 years due to the incident.Madewell’s threat came the day after Warren County High School was evacuated and its students bused to the Civic Center for safety due to a bomb threat a student found scribbled on a boy’s bathroom wall.