20 ILCS 2630/9.5
Every county medical examiner and coroner shall provide to the Illinois State Police a sample of dried blood and buccal specimens (tissue may be submitted if no uncontaminated blood or buccal specimens can be obtained) from a dead body for DNA fingerprint analysis if the Illinois State Police notifies the medical examiner or coroner that the Illinois State Police has determined that providing that sample may be useful for law enforcement purposes in a criminal investigation. In addition, if a local law enforcement agency notifies a county medical examiner or coroner that such a sample would be useful in a criminal examination, the county medical examiner or coroner shall provide a sample to the local law enforcement agency for submission to the Illinois State Police .
20 ILCS 2630/9.5