Cornell law professor Sherry F. Colb describes how the U.S. Supreme Court purported to allow the state of Kansas to substitute one insanity defense for another, but in fact approved its abolishment of the insanity defense altogether. Colb explains the difference between the insanity defense—an affirmative defense to the commission of a crime—and facts that negate mens rea—the mental element of a crime. Colb also notes how in dissent, Justice Stephen Breyer made a case for veganism, albeit probably inadvertently.

Cornell law professor Sherry F. Colb describes an incident where her dog “K” stalked and killed a rabbit, and she considers what criminal-law inferences we might draw from observing such predators’ behavior toward their prey. Colb ponders what distinguishes a dog who kills a rabbit from psychopaths who commit heinous crimes, noting that among humans, a so-called “moral imbecile” lacks conscience and empathy for others, and our society deems such individuals as deserving punishment.

Cornell law professor Sherry F. Colb comments on the insanity defense, considering when and why juries (and others) might perceive a criminal defendant to be not guilty by reason of insanity. Colb proposes that if a criminal defendant’s mental illness looks like an outside force that made him behave in an out-of-character fashion, then the jury is more likely to find him not guilty by reason of insanity.

Cornell law professor Sherry F. Colb why the question whether a state may abolish the insanity defense (presently before the Supreme Court) is similar to the question whether a state should adopt so-called animal welfare laws. Colb argues that both the insanity defense and animal welfare measures provide the public with a sense of moral relief but only if we willfully ignore the reality of how animals and criminal defendants are treated.

Cornell law professor Sherry F. Colb discusses a question the U.S. Supreme Court will consider next term—whether the U.S. Constitution prohibits a state’s abolition of the insanity defense. Colb points out the various ways in which our current criminal justice system arbitrarily excuses some sources of criminal conduct but not others, and she argues that because of these inconsistencies already inherent in the system, the insanity defense cannot logically be required.