Ill. Admin. Code tit. 2, § 3430.80
5) Voluntary production of documents and/or information.
8) Subpoenas for records and/or testimony.
d) Determining which method of investigation is appropriate will vary depending on the nature of the allegation and the balancing of various criteria that include, but are not limited to, the following:
3) The type of information being sought.
e) Minimum investigatory requirements for completing an investigation:
f) Subpoena Powers