The consent form shall be signed by the person entitled to give consent and the signature shall be witnessed by a person who can attest to the identity of the person so entitled. A copy of the consent and a notation as to any action taken thereon shall be entered in the recipient's record. Any revocation of consent shall be in writing, signed by the person who gave the consent and the signature shall be witnessed by a person who can attest to the identity of the person so entitled. No written revocation of consent shall be effective to prevent disclosure of records and communications until it is received by the person otherwise authorized to disclose records and communications.
740 ILCS 110/5