An Illinois Subpoena-People's for Witness-State's attorney is a legal document issued by a state's attorney in the state of Illinois. This document requires a person to appear in court to testify as a witness or to produce documents or other items that are relevant to a legal proceeding. There are two types of Illinois Subpoena-People's for Witness-State's attorney: a subpoena duces tecum, which requires the witness to produce documents or other items, and a subpoena ad testificandum, which requires the witness to appear in court to testify. Both types of subpoenas must be served on the person or entity to whom they are directed, and must include the date and time of appearance, the name of the court, and the name of the case. Failure to comply with the subpoena can result in legal penalties.