CHAPTER IV
GENERAL RULES AS TO CRIMINAL RESPONSIBILITY
13. Insanity Act No.31 of 1997 Sch.
(1) A person shall not be criminally responsible for an act or omission if at the time of doing the act or making the omission he is through any disease affecting his mind—
(a) incapable of understanding what he is doing ;
(b) incapable of appreciating that he ought not to do the act or omission ; or
(c) does not have control of the act or omission.
(2) a person may be criminally responsible for an act or omission although his mind is affected by disease, if such disease does not in fact produce upon his mind one or other of the effects referred to in subsection (1) to that act or omission.
Incapacity - national proceedings
Insanity - national proceedings
Mental disease or defect - national proceedings
EDIT.