The Illinois Certificate of Good Conduct is a document issued by the Illinois State Police that provides evidence of good behavior and character. It is a document that is issued to individuals who have had no criminal convictions in the state of Illinois. The Certificate of Good Conduct is used for the purpose of obtaining employment, professional licensing, or other activities that require proof of good behavior. There are two types of Illinois Certificate of Good Conduct that can be issued: a Standard Certificate and an Enhanced Certificate. The Standard Certificate is generally valid for three years and provides basic proof of good behavior and character. The Enhanced Certificate is valid for five years and provides more detailed information about the individual's criminal history than the Standard Certificate. Both certificates are available through the Illinois State Police website.