325 ILCS 55/3
Upon notification by the Illinois State Police that a person under the age of 18 years who was born in this State is missing, the Registrar shall flag the birth certificate record of that person in such a manner that whenever a copy of the birth certificate or information regarding the birth record is requested, the Registrar shall be alerted to the fact that the certificate is that of a missing child. The Registrar shall also notify the appropriate city or county custodian to likewise flag his records. Upon notification by the Illinois State Police that the missing child has been recovered, the Registrar shall remove the flag from the person's birth certificate record and shall notify any other previously notified city or county custodian to remove the flag from his record.
325 ILCS 55/3