Okla. Stat. tit. 60, § 1604.17
A. A provision in a will or trust that would cause a forfeiture of or void a devise or provision in favor of a person for bringing a court action contesting a will or trust, shall be enforceable unless in a court action determining whether the forfeiture clause should be enforced, the person who brought the action contrary to the forfeiture clause establishes by a preponderance of the evidence that:
Laws 2026, SB 2104, c. 414, § 5, eff. November 1, 2026.