The absolute immunity of parties and witnesses from subsequent liability for their testimony in judicial proceedings developed in early English cases and is well established at common law. Any communication, even perjured testimony, made in the course of a judicial proceeding, cannot serve as the basis for a suit in tort. The rationale for witness immunity, which has become less an evidentiary rule than a rule of substantive law, is that the proper administration of justice requires full and free disclosure from witnesses unhampered by fear of retaliatory lawsuits.