Defenses

(1) A defense is a fact or set of facts which negatives penal liability. (2) No defense may be considered by the trier of fact unless evidence of the specified fact or facts has been presented. If such evidence is presented, then: (a) If the defense is not an affirmative defense, the defendant is entitled to an acquittal if the trier of fact finds that the evidence, when considered in the light of any contrary prosecution evidence, raises a reasonable doubt as to the defendant's guilt; or (b) If the defense is an affirmative defense, the defendant is entitled to an acquittal if the trier of fact finds that the evidence, when considered in light of any contrary prosecution evidence, proves by a preponderance of the evidence the specified fact or facts which negative penal liability. (3) A defense is an affirmative defense if: (a) It is specifically so designated by the Code or another statute; or (b) If the Code or another statute plainly requires the defendant to prove the defense by a preponderance of the evidence.