An Illinois Affidavit In Support of Petition To Expunge Or Seal is a legal document that is used to support a request to expunge or seal a criminal record in the state of Illinois. This document is normally submitted in conjunction with a Petition to Expunge or Seal, which is a formal request to the court to have a criminal record expunged or sealed. The Affidavit is used to provide additional information to the court regarding the petitioner's criminal history, the circumstances of the criminal charge, and the petitioner's current progress and future plans. There are two different types of Illinois Affidavit In Support of Petition To Expunge Or Seal. The first type is a Notarized Affidavit, which requires the petitioner to swear to the information provided in the affidavit before a notary public. The second type is an Unworn Affidavit, which does not require the petitioner to swear to the information, but must be signed and dated in the presence of a witness.