89 Ill. Adm. Code 338.120
Rules of Evidence
Section 338
Section 338.120 Rules of
Evidence
a) All evidence helpful in determining these questions, including
oral and written reports, may be relied upon to the extent of its probative
value, even though not competent under the common law or statutory rules of
evidence.
b) All Department licensing records and investigatory files shall
be admissible to prove the matters contained within the record or investigatory
file.