(1) To be valid, a written waiver of confidentiality must:

(a) Be voluntary;

(b) Relate only to the client or the client's dependent children;

(c) Clearly describe the scope and any limitations of the information to be released;

(d) Include an expiration date for the release; and

(e) Inform the client that consent may be withdrawn at any time whether it is made orally or in writing.

(2) If the written waiver of confidentiality does not include an expiration date, it expires ninety days after the date it was signed.