Law Commons^™

When Discretion To Record Becomes Assertive: Body Camera Footage As Hearsay, Natalie P. Pike

Vanderbilt Journal of Entertainment & Technology Law

As police body camera footage pervades courtrooms across the country as evidence in criminal trials, courts must reevaluate whether, and under which evidentiary frameworks, they will admit the footage to prove that what the footage depicts is true. This Note analyzes the frameworks under which courts have historically admitted filmic evidence: namely, through authentication and as demonstrative evidence. It concludes that body camera footage is distinct from evidence traditionally admitted through those frameworks because body camera footage is akin to an officer's assertive statement--the officer has discretion to activate and aim the body camera. Courts should therefore exclude the footage …

Surprise Vs. Probability As A Metric For Proof, Edward K. Cheng, Matthew Ginther

Vanderbilt Law School Faculty Publications

In this Symposium issue celebrating his career, Professor Michael Risinger in Leveraging Surprise proposes using "the fundamental emotion of surprise" as a way of measuring belief for purposes of legal proof. More specifically, Professor Risinger argues that we should not conceive of the burden of proof in terms of probabilities such as 51%, 95%, or even "beyond a reasonable doubt." Rather, the legal system should reference the threshold using "words of estimative surprise" -asking jurors how surprised they would be if the fact in question were not true. Toward this goal (and being averse to cardinality), he suggests categories such …

Manipulation Of Suspects And Unrecorded Questioning, Christopher Slobogin

Vanderbilt Law School Faculty Publications

Fifty years after Miranda, courts still do not have clear guidance on the types oftechniques police may use during interrogation. While first-generation tactics (a.k.a. the third degree) are banned, second-generation tactics such as those found in the famous Reid Manual continue to be used by interrogators. The Supreme Court has sent only vague signals as to which of these second- generation techniques, if any, are impermissible, and has made no mention of newly developed third-generation tactics that are much less reliant on manipulation. This Article divides second-generation techniques into four categories: impersonation, rationalization, fabrication, and negotiation. After concluding, based on …

I See Dead People: Examining The Admissibility Of Living-Victim Photographs In Murder Trials, Susanna Rychlak

Vanderbilt Law Review

In the summer of 2015, the Tennessee legislature debated and passed the "Victim Life Photo Act," which went into effect on July 1, 2015. This law states: "In a prosecution for any criminal homicide, an appropriate photograph of the victim while alive shall be admissible evidence when offered by the district attorney general to show the general appearance and condition of the victim while alive." Victims' rights groups lobbied for this and similar laws throughout the country, which were then enacted by state legislatures. Though these laws amended rules of evidence, the considerations under which they were passed were largely …

Bruton On Balance: Standardizing Redacted Codefendant Confessions Through Federal Rule Of Evidence 403, Margaret Dodson

Vanderbilt Law Review

Joint criminal trials are a relatively common practice in the American criminal justice system. When multiple criminal defendants are charged in a single crime-especially in conspiracy cases-courts and prosecutors alike favor joint trials because of their comparable efficiency to individual trials. However, joint trials can raise significant procedural and constitutional concerns for codefendants. One such issue arises when the government seeks to introduce the confession of a non-testifying defendant (hereinafter a "declarantdefendant") that inculpates other codefendants.

When introduced, such confessions raise potential Sixth Amendment issues under Bruton v. United States. A Bruton violation occurs in a joint trial when a …

From Nuremberg To Kenya: Compiling The Evidence For International Criminal Prosecutions, Jennifer Stanley

Vanderbilt Journal of Transnational Law

The Prosecutor of the International Criminal Court has encountered significant difficulty in conducting investigations. Faced with violence on the ground, witnesses who fear repercussions, and limitations on resources, the Prosecutor has turned to relying on secondary forms of evidence, such as the reports of NGOs and other third-party information providers.

This Note argues that the Prosecutor's use of such evidence is problematic because it fails to adequately follow the evidentiary rules of the Court and, subsequently, to protect the rights of witnesses and defendants. Moreover, the Office of the Prosecutor's dependence on third-party evidence has stunted the Prosecutor's ability to …

The Incompatibility Of Due Process And Naked Statistical Evidence, G. Alexander Nunn

Vanderbilt Law Review

Qualitative evidence is a cornerstone of the modern trial system. Parties often invoke eyewitness testimony, character witnesses, or other forms of direct and circumstantial evidence when seeking to advance their case in the courtroom, enabling jurors to reach a verdict after weighing two competing narratives.' But what if testimonial, experience-based evidence were removed from trials? In a legal system that draws its legitimacy from centuries of tradition-emphasizing notions of fairness even above absolute accuracy. Would a jury, not to mention the public at large, reject a verdict that imposes liability or guilt on a defendant in the complete absence of …

Confrontation And The Law Of Evidence: Can The Language Conduit Theory Survive In The Wake Of Crawford?, Tom S. Xu

Vanderbilt Law Review

A foreign traveler flies into John F. Kennedy International Airport, supposedly on a business trip. At the airport, a customs inspector detains him after discovering what appear to be bags of cocaine concealed in his luggage. The traveler speaks limited English, so the inspector requests the aid of a certified government interpreter to question him. An English-speaking Drug Enforcement Administration ("DEA") agent thereafter interrogates the traveler by having the interpreter translate his questions to Spanish, the traveler's native tongue. The interpreter then translates the traveler's responses from Spanish to English, and the inspector records the translated responses. At trial, the …

Neuroscientists In Court, Owen D. Jones, Anthony D. Wagner, David L. Faigman, Marcus E. Raichle

Vanderbilt Law School Faculty Publications

Neuroscientific evidence is increasingly being offered in court cases. Consequently, the legal system needs neuroscientists to act as expert witnesses who can explain the limitations and interpretations of neuroscientific findings so that judges and jurors can make informed and appropriate inferences. The growing role of neuroscientists in court means that neuroscientists should be aware of important differences between the scientific and legal fields, and, especially, how scientific facts can be easily misunderstood by non-scientists,including judges and jurors.

This article describes similarities, as well as key differences, of legal and scientific cultures. And it explains six key principles about neuroscience that …

Group To Individual Inference In Scientific Expert Testimony, Christopher Slobogin, David Faigman, John Monahan

Vanderbilt Law School Faculty Publications

A fundamental divide exists between what scientists do as scientists and what courts often ask them to do as expert witnesses. Whereas scientists almost invariably inquire into phenomena at the group level, trial courts typically need to resolve cases at the individual level. In short, scientists generalize while courts particularize. A basic challenge for trial courts that rely on scientific experts, therefore, concerns determining whether and how scientific knowledge derived from studying groups can be helpful in the individual cases before them (what this Article refers to as "G2i'). To aid in dealing with this challenge, this Article proposes a …

The Nature And Purpose Of Evidence Theory, Michael S. Pardo

Vanderbilt Law Review

pproximately twenty-five years ago, Professor Richard Lempert, reflecting on the then-current state of evidence scholarship, noted a dramatic shift underway.' He described what had become a largely "moribund" field giving way to a burgeoning "new evidence scholarship." The scholarship in the moribund phase employed "a timid kind of deconstructionism with no overarching critical theory," was "seldom interesting," and any "potential utility" was "rarely realized"; Lempert proposed the following mock article title as a model representing the genre: "What's Wrong with the Twenty-Ninth Exception to the Hearsay Rule and How the Addition of Three Words Can Correct the Problem." By contrast, …

Reconceptualizing The Burden Of Proof, Edward K. Cheng

Vanderbilt Law School Faculty Publications

The preponderance standard is conventionally described as an absolute probability threshold of 0.5. This Essay argues that this absolute characterization of the burden of proof is wrong. Rather than focusing on an absolute threshold, the Essay reconceptualizes the preponderance standard as a probability ratio and shows how doing so eliminates many of the classical problems associated with probabilistic theories of evidence. Using probability ratios eliminates the so-called Conjunction Paradox, and developing the ratio tests under a Bayesian perspective further explains the Blue Bus problem and other puzzles surrounding statistical evidence. By harmonizing probabilistic theories of proof with recent critiques advocating …

Book Review: Burden Of Proof: A Review Of Math On Trial, Paul H. Edelman

Vanderbilt Law School Faculty Publications

In Math on Trial, Leila Schneps and Coralie Col­ mez write about the abuse of mathematical argu­ ments in criminal trials and how these flawed arguments "have sent innocent people to prison" (p. ix). Indeed, people "saw their lives ripped apart by simple mathematical errors." The purpose of focusing on these errors, despite mathematics' "relatively rare use in trials" (p. x), is "that many of the common mathematical fallacies that pervade the public sphere are perfectly represented by these trials. Thus they serve as ideal illustrations of these errors and of the drastic consequences that faulty reasoning has on real …

Music And Emotion In Victim-Impact Evidence, Emily C. Green

Vanderbilt Journal of Entertainment & Technology Law

Aristotle famously said that the "law is reason free from passion," and nothing arouses passion better than music. Thus, when victim-impact evidence evolved from simple oral statements to include photographs, video footage, and musical clips, scholars and judges alike expressed concern that music might be too emotional and may make it difficult for the jury to make a rational decision based on logic rather than feeling. Recent scholarship in the field of law and emotion, however, notes that emotions are inevitable in law and further suggests that these emotions can be used constructively in the legal system. Thus, musically induced …

Being Pragmatic About Forensic Linguistics, Edward K. Cheng

Vanderbilt Law School Faculty Publications

This article aims to provide some legal context to the Authorship Attribution Workshop (“conference”). In particular, I want to offer some pragmatic observations on what courts will likely demand of forensic linguistics experts and tentatively suggest what the field should aspire to in both the short and long run.

Erie And The Rules Of Evidence, Edward K. Cheng

Vanderbilt Law School Faculty Publications

Jay Tidmarsh offers an intriguing new test for drawing the allimportant line between procedure and substance for purposes of Erie. The Tidmarsh test is attractively simple, yet seemingly reaches the right result in separating out truly “procedural” rules from more substantive ones. Since I am not a proceduralist, in this Response I will leave the Tidmarsh test’s explanatory power and practical workability vis-à-vis general civil procedure rules to others more qualified than I. Instead, I want to focus on the implications of the Tidmarsh test for the Federal Rules of Evidence. Like others in the evidence world, I have long …

When 10 Trials Are Better Than 1000: An Evidentiary Perspective On Trial Sampling, Edward K. Cheng

Vanderbilt Law School Faculty Publications

In many mass tort cases, separately trying all individual claims is impractical, and thus a number of trial courts and commentators have explored the use of statistical sampling as a way of efficiently processing claims. Most discussions on the topic, however, implicitly assume that sampling is a “second best” solution: individual trials are preferred for accuracy, and sampling only justified under extraordinary circumstances. This Essay explores whether this assumption is really true. While intuitively one might think that individual trials would be more accurate at estimating liability than extrapolating from a subset of cases, the Essay offers three ways in …

Compelled Production Of Encrypted Data, John E.D. Larkin

Vanderbilt Journal of Entertainment & Technology Law

There is a myth that shadowy and powerful government agencies can crack the encryption software that criminals use to protect computers filled with child pornography and stolen credit card numbers. The reality is that cheap or free encryption programs can place protected data beyond law enforcement's reach. If courts seriously mean to protect the victims of Internet crime--all too often children--then Congress must adopt a legal mechanism to remedy the technological deficiency.

To date, police and prosecutors have relied on subpoenas to either compel defendants to produce their password, or to decipher their protected data. This technique has been met …

The Risks Of Taking Facebook At Face Value: Why The Psychology Of Social Networking Should Influence The Evidentiary Relevance Of Facebook Photographs, Kathryn R. Brown

Vanderbilt Journal of Entertainment & Technology Law

Social networking sites in general, and Facebook in particular, have changed the way individuals communicate and express themselves. Facebook users share a multitude of personal information through the website, especially photographs. Additionally, Facebook enables individuals to tailor their online profiles to project a desired persona. However, as social scientists have demonstrated, the image users portray can mislead outside observers. Given the wealth of information available on Facebook, it is no surprise that attorneys often peruse the website for evidence to dispute opponents' claims.

This Note examines the admission and relevance of Facebook photographs offered to prove a litigant's state of …

Plea Bargaining, Discovery, And The Intractable Problem Of Impeachment Disclosures, R. Michael Cassidy

Vanderbilt Law Review

Several recent high-profile cases have illustrated flaws with the government's discovery practices in criminal cases and have put prosecutors across the country on the defensive about their compliance with disclosure obligations. The conviction of former Alaska Senator Ted Stevens on ethics charges was set aside after it was revealed that federal prosecutors withheld notes of an interview with a key government witness; one member of the Stevens prosecution team who was under investigation for contempt subsequently committed suicide. The Supreme Court remanded a double murder case from Tennessee for potential resentencing after it was revealed that state prosecutors had withheld …

Rethinking Jurisdictional Discovery Under The Hague Evidence Convention, Kathleen B. Gilchrist

Vanderbilt Journal of Transnational Law

When a federal court in the United States compels the discovery of information located abroad to determine whether it has jurisdiction over the defendant, the court can apply the Federal Rules of Civil Procedure or the Hague Evidence Convention. This Note argues that the approach taken by most courts--applying the balancing test formulated by the Supreme Court in Societe Nationale Industrielle Aerospatiale v. U.S. District Court and favoring application of the Federal Rules--is misguided. Courts should apply the Evidence Convention more often in jurisdictional discovery disputes. They can do so under the existing legal framework with one of three holdings: …

Brain Scans As Evidence: Truths, Proofs, Lies, And Lessons, Owen D. Jones, Francis X. Shen

Vanderbilt Law School Faculty Publications

This contribution to the Brain Sciences in the Courtroom Symposium identifies and discusses issues important to admissibility determinations when courts confront brain-scan evidence. Through the vehicle of the landmark 2010 federal criminal trial U.S. v. Semrau (which considered, for the first time, the admissibility of brain scans for lie detection purposes) this article highlights critical evidentiary issues involving: 1) experimental design; 2) ecological and external validity; 3) subject compliance with researcher instructions; 4) false positives; and 5) drawing inferences about individuals from group data. The article’s lessons are broadly applicable to the new wave of neurolaw cases now being seen …

Scientific Evidence As Foreign Law, Edward K. Cheng

Vanderbilt Law School Faculty Publications

Most contemporary debates about scientific evidence focus on admissibility under Daubert and the Federal Rules of Evidence. That bias is quite understandable-after all, it is the framework imposed by the United States Supreme Court. Daubert, however, rests on a fundamental assumption: that courts should treat scientific facts like any other adjudicative facts ultimately left to the jury. Perhaps the involvement of specialized knowledge requires judges to act as gatekeepers to ensure some basic level of reliability, but under Daubert, scientific facts are still just facts. As I will argue, scientific facts fit awkwardly into the conventional framework for conceptualizing and …

Not Guilty By Reason Of Neuroimaging: The Need For Cautionary Jury Instructions For Neuroscience Evidence In Criminal Trials, E. Spencer Compton

Vanderbilt Journal of Entertainment & Technology Law

Neuroimaging technology gives researchers the ability to see structures and functions of the human brain. As the technology advances, it is beginning to change the way the legal field understands the brain and its impact on legal concepts of capacity, sanity, guilt, and innocence. However, the sophisticated technology poses risks that juries will misunderstand the limits of the science or misapply the technical findings to a particular case. To combat the risk of undue prejudice, this Note proposes a cautionary jury instruction designed to remind jurors of the technical and legal limits of bringing neuroimages into the courtroom.

Will Quants Rule The (Legal) World?, Edward K. Cheng

Vanderbilt Law School Faculty Publications

Professor Ian Ayres, in his new book, Super Crunchers, details the brave new world of statistical prediction and how it has already begun to affect our lives. For years, academic researchers have known about the considerable and at times surprising advantages of statistical models over the considered judgments of experienced clinicians and experts. Today, these models are emerging all over the landscape. Whether the field is wine, baseball, medicine, or consumer relations, they are vying against traditional experts for control over how we make decisions. For the legal system, the take-home of Ayres's book and the examples he describes is …

Law, Statistics, And The Reference Class Problem, Edward K. Cheng

Vanderbilt Law School Faculty Publications

Statistical data are powerful, if not crucial, pieces of evidence in the courtroom. Whether one is trying to demonstrate the rarity of a DNA profile, estimate the value of damaged property, or determine the likelihood that a criminal defendant will recidivate, statistics often have an important role to play. Statistics, however, raise a number of serious challenges for the legal system, including concerns that they are difficult to understand, are given too much deference from juries, or are easily manipulated by the parties' experts. In this preview piece, I address one of these challenges, known as the "reference class problem," …

A Practical Solution To The Reference Class Problem, Edward K. Cheng

Vanderbilt Law School Faculty Publications

The "reference class problem" is a serious challenge to the use of statistical evidence that arguably arises every day in wide variety of cases, including toxic torts, property valuation, and even drug smuggling. At its core, it observes that statistical inferences depend critically on how people, events, or things are classified. As there is (purportedly) no principle for privileging certain categories over others, statistics become manipulable, undermining the very objectivity and certainty that make statistical evidence valuable and attractive to legal actors. In this paper, I propose a practical solution to the reference class problem by drawing on model selection …

An Indirect-Effects Model Of Mediated Adjudication: The Csi Myth, The Tech Effect, And Metropolitan Jurors' Expectations For Scientific Evidence, Hon. Donald E. Shelton, Young S. Kim, Gregg Barak

Vanderbilt Journal of Entertainment & Technology Law

Part I of this article defines the "CSI effect," a phrase has come to have many different meanings ascribed to it. It emphasizes the epistemological importance of first describing the effect of the "CSI effect" as observed in juror behavior documented in a new study conducted in Wayne County (Detroit), Michigan, and then looking at causative factors that may be related to an explanation of those observed effects. Part II describes the methodology of the Wayne County study, provides a descriptive analysis of Wayne County jurors, and compares the jurors demographically to the Washtenaw County jurors who were surveyed in …

Experts, Mental States, And Acts, Christopher Slobogin

Vanderbilt Law School Faculty Publications

This article, written for a symposium on "Guilt v. Guiltiness: Are the Right Rules for Trying Factual Innocence Inevitably the Wrong Rules for Trying Culpability?," argues that the definition of expertise in the criminal justice system, derived in the federal courts and in most states from Daubert v. Merrell Dow Pharmaceuticals Co., should vary depending on whether the issue involved is past mental state or past conduct. While expert psychological testimony about past acts ought to be based on scientifically verifiable assertions, expert psychological testimony about subjective mental states relevant to criminal responsibility need not meet the same threshold. This …

The Individualization Fallacy In Forensic Science Evidence, Michael J. Saks, Jonathan J. Koehler

Vanderbilt Law Review

Forensic identification science involves two fundamental steps. The first step is to compare a questioned item of evidence to an exemplar from a known source and judge whether they appear so alike that they can be said to match. The second step is to assess the meaning of that reported match: What is the probability that the questioned and the known originated from the same source?

Different risks of error are present at each step. The risk of error in the first step is that a reported match between a questioned and a known sample might not really match. Even …