Illinois Preliminary Hearing Waiver is a legal document used to waive the right to a preliminary hearing in Illinois criminal proceedings. If a defendant chooses to waive their right to a preliminary hearing, the case moves directly to the next stage of the criminal process. There are two types of Illinois Preliminary Hearing Waiver: a voluntary waiver and an involuntary waiver. A voluntary waiver is signed by the defendant indicating that they waive their right to a preliminary hearing and agree to proceed to the next step in the criminal process. An involuntary waiver is issued by the court when the defendant fails to appear for their preliminary hearing. The waiver is issued to proceed with the case without the defendant present.