D.C. Code § 16-4018: Waiver and preclusion of privilege.

(a)

A privilege under § 16-4017 may be waived in a record or orally during a proceeding if it is expressly waived by all parties entitled to claim the privilege at issue and, in the case of the privilege of a nonparty participant, it is also expressly waived by the nonparty participant.

(b)

A person that makes a disclosure or representation about a collaborative law communication that prejudices another person in a proceeding may not assert a privilege under § 16-4017, but this preclusion applies only to the extent necessary for the person prejudiced to respond to the disclosure or representation.