Discuss the legal and practical differences between a justification and an excuse.
2) What is needed for an insanity plea to be approved by the courts? Give an example of a case that was approved for the insanity plea and the requisites behind that decision. 
 
3) After Bill was arrested for robbery, his mental condition went from functioning to nonfunctioning. He no longer can help his lawyer defend him because he is no longer competent. What defense, if any, does Bill have to the charge of robbery? Will he be successful?