210 ILCS 30/9

Any person who makes a report or who investigates a report under this Act shall testify fully in any judicial proceeding 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 resident subject of the report under this Act and the person making or investigating the report.