Tex. Ins. Code § 705.005
(b) A defendant may use as a defense a misrepresentation made in the application for or in obtaining an insurance policy only if the defendant shows at trial that before the 91st day after the date the defendant discovered the falsity of the representation, the defendant gave notice that the defendant refused to be bound by the policy:
(c) This section does not:
Added by Acts 2003, 78th Leg., ch. 1274, Sec. 2, eff. April 1, 2005.