325 ILCS 5/10
Any person who makes a report or who investigates a report under this Act shall testify fully in any judicial proceeding or administrative hearing resulting from such report, as to any evidence of abuse or neglect, or the cause thereof. Any person who is required to report a suspected case of abuse or neglect under Section 4 of this Act shall testify fully in any administrative hearing resulting from such report, as to any evidence of abuse or neglect or the cause thereof. No evidence shall be excluded by reason of any common law or statutory privilege relating to communications between the alleged perpetrator of abuse or neglect, or the child subject of the report under this Act and any person who is required to report a suspected case of abuse or neglect under Section 4 of this Act or the person making or investigating the report.
325 ILCS 5/10