50 Ill. Adm. Code 2402.210
Evidence
Section 2402
Section 2402.210 Evidence
a) The Hearing Officer shall receive evidence which is admissible
under the law of the rules of evidence of Illinois pertaining to civil actions.
In addition, the Hearing Officer may receive material, relevant evidence, which
would be relied upon by a reasonably prudent person in the conduct of serious
affairs, which is reasonably reliable and reasonably necessary to resolution of
the issue for which it is offered; provided that the rules relating to
privileged communications and privileged topics shall be observed.
b) The Hearing Officer shall exclude immaterial, irrelevant, and
repetitious evidence.
c) When the admissibility of disputed evidence depends upon an
arguable interpretation of substantive law, the Hearing Officer shall admit
such evidence.
d) A party may conduct examinations or cross-examinations without
rigid adherence to formal rules of evidence, provided the examination or
cross-examination can be shown to be necessary and pertinent to a full and fair
disclosure of the subject matters of the hearing.