Rex v. Arnold was famous in insanity law as it provided courts the use of:

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Rex v. Arnold is famous for introducing the "wild beast test" in insanity law, which suggested that to establish a defense on the ground of insanity, it must be clearly proved that, at the time of committing the act, the party accused was laboring under such a defect of reason, from disease of the mind, as not to know the nature and quality of the act he was doing, or if he did know it, that he did not know he was doing what was wrong, comparing the accused's understanding to that of a "wild beast."

Rex V Arnold Was Famous in Insanity Law as It Provided