The Lawletter Vol 46 No 1
Mark Rieber—Senior Attorney, National Legal Research Group
In Kahler v. Kansas, 140 S. Ct. 1021 (2020), the U.S. Supreme Court recently held that the Due Process Clause of the U.S. Constitution does not require a state to adopt a particular formulation of the insanity defense. The ruling came in a case out of Kansas where the state had adopted the "cognitive incapacity" test, which examines whether a defendant was able to understand what he was doing when he committed the crime. The Kansas statute does not incorporate the "moral incapacity" test, which is the inquiry into whether a defendant could not distinguish right from wrong when committing the crime. The defendant contended that the state's failure to allow a defendant to raise a defense based on "moral incapacity" violated due process. The Court rejected such argument, holding that a state's insanity rule was substantially open to state choice.
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