A defense attorney making use of the conditions of the American Law Institute model legislation on the insanity defense would have to provide evidence that her client

a. was mentally ill at the time of his offense.
b. lacked substantial capacity to appreciate the criminality [wrongfulness] of his offense.
c. lacked a knowledge of the law that he is accused of due to his mental illness.
d. demonstrated substantial capacity to control his actions.

Answer: b.