42 Pa.C.S. § 7404
(a) General assessment.— Before entering into a collaborative law participation agreement, a prospective party shall:
(b) Threatening or violent behavior.—
(2) If an attorney learns or reasonably believes, before commencing or at any point in the collaborative law process, that a party or prospective party has engaged in or has a history of threatening or violent behavior toward any other party or nonparty participant, the attorney may not begin or continue the collaborative law process unless the party or prospective party: