The criminal defendant is presumed innocent and his guilt must be proved beyond reasonable doubt for conviction. On some issues, however, the defendant must prove his innocence on the balance of probabilities to avoid conviction. Commentators have despaired of reconciling reverse burdens with the presumption in a principled way. Andrew Stumer has made a fresh attempt; however, his solution is overly rigid and rule bound. The presumption is engaged in a dynamic enterprise—minimizing the expected cost of error, mistaken acquittals as (...) well as wrongful convictions. Stumer’s fixed criminal standard and stringent restrictions on reverse burdens work against this goal. A more flexible approach is required, reflecting the calculus of error management. Where the cost or probability of wrongful conviction is relatively low, and the cost or probability of mistaken acquittal relatively high, it may be necessary to lower the standard of proof, or even to reverse the burden of proof. To inhibit these strategies is to increase the expected cost of error at trial. (shrink)

This article reviews contemporary response to several contrasting strands of recent empirical work. It begins with discussing the scope and rationale of evidence law. Experimental studies on eyewitness memory and testimony illustrate the potential value of empirical studies to the practice of investigations, prosecutions, and appeals. This article discusses several lines of empirical inquiry employing diverse methodologies, experiments, surveys, and approaches and reviews their limitations, and implications and significance for the understanding and practice of law. Many of the contributions from (...) empirical legal studies are provisional and their precise value for practice is uncertain or ambiguous, but they raise important issues worthy of serious consideration. By identifying problems with eyewitness evidence and the limitations of many of the forensic sciences, and in many other ways, empirical and experimental studies have substantially outpaced legal experience. Indifference to empirical legal study is likely to reduce the social legitimacy of legal institutions. (shrink)