Tarasoff in Missouri: The jurisprudence of a mental health provider's duty to warn and protect non-patients of potential risks from patients.

In 1976, the Supreme Court of California issued its well-known Tarasoff Principle. From this principle, other courts found a duty to warn, and some found more than just a duty to warn, a duty to protect. As courts in other states adopted a version of the Tarasoff Principle, they issued a wide variety of third-party liability rules.