Kan. Stat. § 21-5209 : — CRIMES AND PUNISHMENTSPRINCIPLES OF CRIMINAL LIABILITY —5209 - Defense of lack of mental state TEXT PDF It shall be a defense to a prosecution under any statute that the defendant, as a result of mental disease or defect, lacked the culpable mental state required as an element of the crime charged. Mental disease or defect is not otherwise a defense. K.S.A. 21-5209 L. 1995, ch. 251, § 20; July 1; L. 2010, ch. 136, § 20, 7/1/2011.