Lawrence B. Solum

Could an artificial intelligence become a legal person? As of today, this question is only theoretical. No existing computer program currently possesses the sort of capacities that would justify serious judicial inquiry into the question of legal personhood. The question is nonetheless of some interest. Cognitive science begins with the assumption that the nature of human intelligence is computational, and therefore, that the human mind can, in principle, be modelled as a program that runs on a computer. Artificial intelligence (AI) research attempts to develop such models. But even as cognitive science has displaced behavioralism as the dominant paradigm for investigating the human mind, fundamental questions about the very possibility of artificial intelligence continue to be debated. This Essay explores those questions through a series of thought experiments that transform the theoretical question whether artificial intelligence is possible into legal questions such as, "Could an artificial intelligence serve as a trustee?" What is the relevance of these legal thought experiments for the debate over the possibility of artificial intelligence? A preliminary answer to this question has two parts. First, putting the AI debate in a concrete legal context acts as a pragmatic Occam's razor. By reexamining positions taken in cognitive science or the philosophy of artificial intelligence as legal arguments, we are forced to see them anew in a relentlessly pragmatic context. Philosophical claims that no program running on a digital computer could really be intelligent are put into a context that requires us to take a hard look at just what practical importance the missing reality could have for the way we speak and conduct our affairs. In other words, the legal context provides a way to ask for the "cash value" of the arguments. The hypothesis developed in this Essay is that only some of the claims made in the debate over the possibility of AI do make a pragmatic difference, and it is pragmatic differences that ought to be decisive. Second, and more controversially, we can view the legal system as a repository of knowledge-a formal accumulation of practical judgments. The law embodies core insights about the way the world works and how we evaluate it. Moreover, in common-law systems judges strive to decide particular cases in a way that best fits the legal landscape-the prior cases, the statutory law, and the constitution. Hence, transforming the abstract debate over the possibility of AI into an imagined hard case forces us to check our intuitions and arguments against the assumptions that underlie social decisions made in many other contexts. By using a thought experiment that explicitly focuses on wide coherence, we increase the chance that the positions we eventually adopt will be in reflective equilibrium with our views about related matters. In addition, the law embodies practical knowledge in a form that is subject to public examination and discussion. Legal materials are published and subject to widespread public scrutiny and discussion. Some of the insights gleaned in the law may clarify our approach to the artificial intelligence debate.

The purpose of this essay is two-fold. The first aim is to introduce the reader to Semantic Originalism - a version of the New Originalism that is fully articulated in a long article of that name. The reader's guide in Part II provides a very short summary and accessible guide to the argument of Semantic Originalism. The second aim is to provide access to an exchange between Stephen Griffin and myself in the Blogosphere. Griffin's eight questions and comments about Semantic Originalism and my replies are reproduced in lightly edited form in Part III. My concluding remarks about Griffin's questions included a three dimensional model of the space of theoretical argument about originalism: that model is presented in Part IV. This version of "A Reader's Guide to Semantic Originalism and a Reply to Professor Griffin" was uploaded on June 19, 2008, and it replaces all prior versions.

The Aretaic Turn in Constitutional Theory argues that an institutional approach to theories of constitutional interpretation ought to be supplemented by explicit focus on the virtues and vices of constitutional adjudicators. Part I, The Most Dysfunctional Branch, advances the speculative hypothesis that politicization of the judiciary has led the political branches to exclude consideration of virtue from the nomination and confirmation of Supreme Court Justices and to select Justices on the basis of the strength of their commitment to particular positions on particular issues and the fervor of their ideological passions. Part II, Institutionalism and Constitutional Interpretation, engages Cass Sunstein and Adrian Vermeule's recent essay, "Interpretation and Institutions." Sunstein and Vermeule contend that theories of constitutional interpretation are most fundamentally flawed because of their failure to take an institutional turn, but their supporting arguments lead to a related but quite distinct conclusion. Only a theory of judicial character can supply the diagnosis for the ills that Sunstein and Vermeule identify: constitutional theory must take an aretaic turn. Part III, Making the Aretaic Turn in Constitutional Theory, sketches an alternative approach to judicial review and constitutional interpretation that is rooted in contemporary virtue ethics. In Part IV, Constitutional Virtues and Vices, this sketch is given flesh and bones in the form of a theory of constitutional virtue and vice. Excellence in constitutional adjudication requires the virtues of judicial courage, judicial temperament, judicial temperance, judicial intelligence, and judicial wisdom (or phronesis). Most importantly, a virtuous constitutional interpreter must have the virtue of justice, which includes as components impartiality, lawfulness, and legal vision. Part V, The Aretaic Reconstruction of the Institutional Critique, returns to institutionalism as an approach to the theory of constitutional interpretation and argues that institutionalists cannot coherently refrain from making the aretaic turn. The article ends with speculation about the possibility of a path to the restoration of judicial virtue.