80 Ill. Adm. Code 1.234
Hostile Witness
Section 1
Section 1.234 Hostile Witness
If the Administrative Law Judge
determines that a witness is hostile or unwilling, examination of the witness
by the calling party may be conducted as if under cross-examination. The party
calling an occurrence witness may, upon showing the witness was called in good
faith but the calling party is surprised by the testimony, impeach the witness
by proof of prior inconsistent statements.