The United States Supreme Court held that the discretionary function exception of the FTCA will not apply when a federal statute, regulation or policy specifically prescribes a course of action for an employee to follow.
Berkovitz v. United States, 108 S. Ct. 1954 (1988).
Elizabeth L. Foster-Nolan,
Government Liability - Federal Tort Claims Act - Discretionary Function Exception,
Duq. L. Rev.
Available at: https://dsc.duq.edu/dlr/vol28/iss1/7