Can you help me understand this Law question?
Affirmative defenses fall under the categories of justification and excuse. Choose one justification defense (self-defense, duress, etc.) and one excuse defense (infancy, mistake of fact, intoxication, etc.).
Explain how these defenses can be used at trial. Should these types of defenses relieve a person of his or her criminal responsibility?
The defense of duress cannot be used in cases of murder.
Is this exception reasonable, or are there murder cases where this defense should be allowed?