Typically, the set of elements defining a crime comprise what may be called the paradigm of liability for that offense: An actor is criminally liable if and only if the state proves all these elements. The paradigm of an offense, however, does not always determine criminal liability. Even where all the elements of the paradigm are proven, rules and doctrines create exceptions that affect criminal liability. Some exceptions, such as insanity, duress, and law enforcement authority, can exculpate an actor even though his conduct and state of mind satisfy the paradigm for the offense charged. Such exculpating exceptions are grouped and analyzed as defenses. Other exceptions inculpate actors who do not satisfy the paradigm for the offense charge...