50 Ill. Adm. Code 2402.230
Hostile Witnesses
Section 2402
Section 2402.230 Hostile
Witnesses
a) If the Hearing Officer determines that a witness is hostile or
unwilling, he may be examined by the party calling him as if under
cross-examination.
b) The party calling an occurrence witness, upon the showing that
he called the witness in good faith and is surprised by his testimony, may
impeach the witness by proof of prior inconsistent statements.