4.3 Article

Rational capacity and criminal responsibility in the USA

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Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijlp.2022.101809

Keywords

Criminal responsibility; Diminished capacity; Insanity defense; Instrumental capacity; Mens rea defense; Psychopathy; Psychosis; Rational capacity

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The recent decision by the United States Supreme Court found that an insanity defense based on moral incapacity is not constitutionally required, allowing states to abolish their insanity defense. Unfortunately, the Court's opinion did not consider irrationality, which is traditionally and universally seen as a crucial element of insanity standards. This perspective review aims to clarify and disambiguate the concepts of instrumental and rational capacities as applied to insanity standards, in order to meet the Court's criteria for constitutionally required due process.
The United States Supreme Court recently found that an insanity defense based upon moral incapacity was not constitutionally required. This decision allows states with a moral incapacity insanity defense, i.e., most states, to abolish their insanity defense. Unfortunately, the Court's opinion was based upon conflated concepts without considering irrationality, traditionally and universally the indispensable core element of insanity standards. This present perspective review attempts to clarify and disambiguate the critical concepts of instrumental and rational capacities as applied to insanity standards. With a proper understanding and application of these distinctly different capacities, insanity standards that at least incorporate rationality should in the future meet the Court's touchstone for determining constitutionally required due process.

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