Evidence Commons^™

Antitrust Harm And Causation, Herbert J. Hovenkamp

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How should plaintiffs show harm from antitrust violations? The inquiry naturally breaks into two issues: first, what is the nature of the harm? and second, what does proof of causation require? The best criterion for assessing harm is likely or reasonably anticipated output effects. Antitrust’s goal should be output as high as is consistent with sustainable competition.

The standard for proof of causation then depends on two things: the identity of the enforcer and the remedy that the plaintiff is seeking. It does not necessarily depend on which antitrust statute the plaintiff is seeking to enforce. For public agencies, enforcement …

Power And Statistical Significance In Securities Fraud Litigation, Jill E. Fisch, Jonah B. Gelbach

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Event studies, a half-century-old approach to measuring the effect of events on stock prices, are now ubiquitous in securities fraud litigation. In determining whether the event study demonstrates a price effect, expert witnesses typically base their conclusion on whether the results are statistically significant at the 95% confidence level, a threshold that is drawn from the academic literature. As a positive matter, this represents a disconnect with legal standards of proof. As a normative matter, it may reduce enforcement of fraud claims because litigation event studies typically involve quite low statistical power even for large-scale frauds.

This paper, written for …

The Use Of Technical Experts In Software Copyright Cases: Rectifying The Ninth Circuit’S “Nutty” Rule, Shyamkrishna Balganesh, Peter Menell

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Courts have long been skeptical about the use of expert witnesses in copyright cases. More than four decades ago, and before Congress extended copyright law to protect computer software, the Ninth Circuit in Krofft Television Prods., Inc. v. McDonald’s Corp., ruled that expert testimony was inadmissible to determine whether Mayor McCheese and the merry band of McDonaldland characters infringed copyright protection for Wilhelmina W. Witchiepoo and the other imaginative H.R. Pufnstuf costumed characters. Since the emergence of software copyright infringement cases in the 1980s, substantially all software copyright cases have permitted expert witnesses to aid juries in understanding software …

Exporting American Discovery, Yanbai Andrea Wang

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This Article presents the first comprehensive study of an intriguing and increasingly pervasive practice that is transforming civil litigation worldwide: US judges now routinely compel discovery in this country and make it available for disputes and parties not before US courts. In the past decade and a half, federal courts have received and granted thousands of such discovery requests for use in foreign civil proceedings governed by different procedural rules. I call this global role played by US courts the “export” of American discovery.

This Article compiles and analyzes a dataset of over three thousand foreign discovery requests filed between …

A Tale Of Two Standards: Why Wyoming Courts Should Apply The Actual Substantial Evidence Standard When Reviewing Workers’ Compensation Cases, Michael C. Duff

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In Wyoming, as in almost all states, facts in contested workers’ compensation cases are developed within an administrative agency. When agency factual findings are challenged in court, the level of judicial deference applied to the agency is important and may be outcome determinative. Wyoming courts claim to apply the “substantial evidence” standard of review, often expressed as evidence that a “reasonable mind could accept” as supporting an agency determination. The Wyoming Supreme Court, however, also sometimes upholds workers’ compensation agency decisions that are deemed “not contrary to the overwhelming weight of the evidence.” It is unclear whether this latter formulation …

The Logic And Limits Of Event Studies In Securities Fraud Litigation, Jill E. Fisch, Jonah B. Gelbach, Jonathan Klick

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Event studies have become increasingly important in securities fraud litigation after the Supreme Court’s decision in Halliburton II. Litigants have used event study methodology, which empirically analyzes the relationship between the disclosure of corporate information and the issuer’s stock price, to provide evidence in the evaluation of key elements of federal securities fraud, including materiality, reliance, causation, and damages. As the use of event studies grows and they increasingly serve a gatekeeping function in determining whether litigation will proceed beyond a preliminary stage, it will be critical for courts to use them correctly.

This Article explores an array of …

Error Costs, Legal Standards Of Proof And Statistical Significance, Michelle Burtis, Jonah B. Gelbach, Bruce H. Kobayashi

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The relationship between legal standards of proof and thresholds of statistical significance is a well-known and studied phenomena in the academic literature. Moreover, the distinction between the two has been recognized in law. For example, in Matrix v. Siracusano, the Court unanimously rejected the petitioner’s argument that the issue of materiality in a securities class action can be defined by the presence or absence of a statistically significant effect. However, in other contexts, thresholds based on fixed significance levels imported from academic settings continue to be used as a legal standard of proof. Our positive analysis demonstrates how a …

Actions Speak Louder Than Images: The Use Of Neuroscientific Evidence In Criminal Cases, Stephen J. Morse

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This invited commentary for Journal of Law & the Biosciences considers four empirical studies previously published in the journal of the reception of neuroscientific evidence in criminal cases in the United States, Canada, England and Wales, and the Netherlands. There are conceded methodological problems with all, but the data are nonetheless instructive and suggestive. The thesis of the comment is that the courts are committing the same errors that have bedeviled the reception of psychiatric and psychological evidence. There is insufficient caution about the state of the science, and more importantly, there is insufficient understanding of the relevance of the …

Using The Dna Testing Of Arrestees To Reevaluate Fourth Amendment Doctrine, Steven P. Grossman

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With the advent of DNA testing, numerous issues have arisen with regard to obtaining and using evidence developed from such testing. As courts have come to regard DNA testing as a reliable method for linking some people to crimes and for exonerating others, these issues are especially significant. The federal government and most states have enacted statutes that permit or direct the testing of those convicted of at least certain crimes. Courts have almost universally approved such testing, rejecting arguments that obtaining and using such evidence violates the Fourth Amendment.

More recently governments have enacted laws permitting or directing the …

Proportionality And The Social Benefits Of Discovery: Out Of Sight And Out Of Mind?, Stephen B. Burbank

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In this short essay, based on remarks delivered at the 2015 meeting of the AALS Section of Litigation, I use a recent paper by Gelbach and Kobayashi to highlight the risk that, in assessing the proportionality of proposed discovery under the 2015 amendments to Rule 26 of the Federal Rules of Civil Procedure, federal judges will privilege costs over benefits, and private over public interests. The risk arises from the temptation to focus on (1) the interests of those who are present to the detriment of the interests of those who are absent (“the availability heuristic”), and (2) variables that …

"Not Just A Common Criminal": The Case For Sentencing Mitigation Videos, Regina Austin

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Sentencing mitigation or sentencing videos are a form of visual legal advocacy that is produced on behalf of defendants for use in the sentencing phases of criminal cases (from charging to clemency). The videos are typically short (5 to 10 minutes or so) nonfiction films that explore a defendant’s background, character, and family situation with the aim of raising factual and moral issues that support the argument for a shorter or more lenient sentence. Very few examples of mitigation videos are in the public domain and available for viewing. This article provides a complete analysis of the constituent elements of …

Catalogs, Gideon Parchomovsky, Alex Stein

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It is a virtual axiom in the world of law that legal norms come in two prototypes: rules and standards. The accepted lore suggests that rules should be formulated to regulate recurrent and frequent behaviors, whose contours can be defined with sufficient precision. Standards, by contrast, should be employed to address complex, variegated, behaviors that require the weighing of multiple variables. Rules rely on an ex ante perspective and are therefore considered the domain of the legislator; standards embody a preference for ex post, ad-hoc, analysis and are therefore considered the domain of courts. The rules/standards dichotomy has become a …

The Duties Of Non-Judicial Actors In Ensuring Competent Negotiation, Stephanos Bibas

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This essay, written for a symposium at Duquesne Law School entitled Plea Bargaining After Lafler and Frye, offers thoughts on how lawyers could learn from doctors’ experience in catching and preventing medical errors and aviation experts’ learning from airplane crashes and near misses. It also expresses skepticism about the efficacy of judges’ ex post review of ineffective assistance of counsel, but holds out more hope that public-defender organizations, bar associations, probation officers, sentencing judges, sentencing commissions, and line and supervisory prosecutors can do much more to prevent misunderstanding and remedy ineffective bargaining advice in the first place.

Bulk Misdemeanor Justice, Stephanos Bibas

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This short essay responds to Alexandra Natapoff’s article Misdemeanors, which shines a much-needed spotlight on the mass production of criminal justice and injustice in millions of low-level cases. The prime culprit in Natapoff’s story is the hidden, informal discretion that police officers enjoy to arrest, charge, and effect convictions, abetted by prosecutors’ and judges’ abdication and defense counsel’s absence or impotence. The roots of the problem she identifies, I argue, go all the way down to the system’s professionalization and mechanization. Given the magnitude of the problem, Natapoff’s solutions are surprisingly half-hearted, masking the deeper structural problems that demand …

"Sweet Childish Days": Using Developmental Psychology Research In Evaluating The Admissibility Of Out-Of-Court Statements By Young Children, Lynn Mclain

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A three-year-old child, while being bathed by her babysitter, innocently mentions that her “pee-pee” hurts. When the babysitter asks the child how she hurt it, she says, “Uncle Ernie (her mother’s boyfriend) told me not to tell.” A subsequent medical examination reveals that the child has gonorrhea, a sexually transmitted disease.

By the time of trial, the child is four and-a-half-years old. When questioned by the trial judge, she cannot explain to the judge’s satisfaction, “the difference between the truth and a lie.” Moreover, she has no long term memory of the incident. The judge rules the child incompetent to …