Insanity – defense to all crimes
1.  M’Naughten Rule
a.  At the time of the conduct, the defendant was unable to:
i.  Know the wrongfulness of his actions, or
ii.  Understand the nature and quality of his actions
2.  Irresistible Impulse test
a.  The defendant was unable to:
i.  Control his actions, or
ii.  Conform his conduct to the law
3.  Durham test (aka New Hampshire test)
a.  The crime was a product of the mental disease/defect
i.  Product of – would not have been committed but for the                         disease
4.  Model Penal Code
a.  Defendant lacked substantial capacity to:
i.  Appreciate the criminality of his conduct, or
ii.  Conform his conduct to the requirements of law