(a) A person who is in an intoxicated or drugged condition whether from alcohol, drugs, or other substance, is criminally responsible for conduct unless such condition:

    (1)    Negatives the existence of the mental states of purpose or knowledge when such mental states are elements of the offense charged or of an included offense; or

    (2)    Is involuntarily produced and deprived him of the capacity to know or appreciate the nature, quality or wrongfulness of his conduct or to conform his conduct to the requirements of law.

    (b) The defendant shall have the burden of injecting the issue of intoxicated or drugged condition.

(Code 1964, § 7.615)

     State law reference(s)--Similar provisions, RSMo. § 562.076.