In the Tarasoff case, the California Supreme Court discovered an exception to the common law rule that a person owes no duty to another to warn others endangered by persons whose conduct he has no duty to control, announcing that such a duty may exist by virtue of

constitutionally protected due process liberty interests

the special relation between therapists of the Univ. of California and a reasonably foreseeable victim of the patient Prosenjit Poddar

the special relation between therapists of the Univ. of California and the patient Prosenjit Poddar, who the therapists predicted, as they should have, would harm the plaintiff's daughter