The origins of criminal law

Laws against wrongdoing may originate in justice intuitions that are part of universal human nature, according to the adaptationist theory of the origins of criminal law. This theory proposes that laws can be traced to neurocognitive mechanisms and ancestral selection pressures. According to this theory, laypeople can intuitively recreate the laws of familiar and unfamiliar cultures, even when they lack the relevant explicit knowledge. Here, to evaluate this prediction, we conduct experiments with Chinese and Sumerian laws that are millennia old; stimuli that preserve in fossil-like form the legal thinking of ancient lawmakers. We show that laypeople’s justice intuitions closely match the logic and content of those archaic laws. We also show covariation across different types of justice intuitions: interpersonal devaluation of offenders, judgements of moral wrongness, mock-legislated punishments and perpetrator shame—suggesting that multiple justice intuitions may be regulated by a common social-evaluative psychology. Although alternative explanations of these findings are possible, we argue that they are consistent with the assumption that the origin of criminal law is a cognitively sophisticated human nature. Sznycer and Patrick show that laypeople can intuitively recreate core aspects of criminal laws drawn from ancient, culturally foreign legal codes and argue that this is consistent with the theory that criminal laws originate in the human brain.