Whether a party is entitled to statutory or common law immunity is a conclusion of law reviewed for correctness. Dorwart v. Caraway, 2002 MT 240, ¶ 29, 312 Mont. 1, 58 P.3d 128. Common law doctrines of immunity are creatures of court decision and subject to change by the courts. Miller v. Fallon County, 222 Mont. 214, 217, 721 P.2d 342, 344 (1986).