50 ILCS 722/25
The coroner or medical examiner shall obtain a DNA sample from any individual whose remains are not identifiable. The DNA sample shall be forwarded to a National Missing and Unidentified Persons System partner laboratory or other resource for analysis and inclusion in the National DNA Index System .
Prior to the burial or interment of any unknown individual's remains or any unknown individual's body part, the medical examiner or coroner in possession of the remains or body part must assign a DNA log number to the unknown individual or body part. The medical examiner or coroner shall place a tag that is stamped or inscribed with the DNA log number on the individual or body part. The DNA log number shall be stamped on the unidentified individual's toe tag, if possible.
50 ILCS 722/25