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Evidence

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Penn State Law

DNA evidence

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Articles 1 - 3 of 3

Full-Text Articles in Law

Confronting Science: Expert Evidence And The Confrontation Clause, David H. Kaye, Jennifer L. Mnookin Jan 2013

Confronting Science: Expert Evidence And The Confrontation Clause, David H. Kaye, Jennifer L. Mnookin

Journal Articles

In Crawford v Washington, the Supreme Court substantially changed its understanding of how the Confrontation Clause applies to hearsay evidence. Since then, the Court has issued three bitterly contested expert-evidence-related Confrontation Clause decisions, and each one has generated at least as many questions as answers. This article analyzes this trilogy of cases, especially the most recent, Williams v Illinois.

In Williams, the Court issued a bewildering array of opinions in which majority support for admitting the opinion of a DNA analyst about tests that she did not perform was awkwardly knitted together out of several incompatible doctrinal …


Trawling Dna Databases For Partial Matches: What Is The Fbi Afraid Of?, David H. Kaye Jan 2009

Trawling Dna Databases For Partial Matches: What Is The Fbi Afraid Of?, David H. Kaye

Journal Articles

DNA evidence is often presented as the “gold standard” for forensic science. But this was not always the case. For years, eminent scientists complained that the estimates of the tiny frequencies of DNA types were unfounded. It took scores of research papers, dozens of judicial opinions, and two committees of the National Academy of Sciences to resolve the dispute by the mid-1990s. Since 2000, however, reports have surfaced of shocking numbers of “partial matches” among samples within large DNA databases, and some scientists have complained that the infinitesimal figures used in court to estimate the probability of a random match …


Dna Typing: Emerging Or Neglected Issues, David H. Kaye, Edward J. Imwinkelried Jan 2001

Dna Typing: Emerging Or Neglected Issues, David H. Kaye, Edward J. Imwinkelried

Journal Articles

DNA typing has had a major impact on the criminal justice system. There are hundreds of opinions and thousands of cases dealing with DNA evidence. Yet, at virtually every stage of the process, there are important issues that are just emerging or that have been neglected.

At the investigative stage, courts have barely begun to focus on the legal limitations on the power of the police to obtain samples directly from suspects and to use the data from DNA samples in various ways. Issues such as the propriety of "DNA dragnets" (in which large numbers of individuals in a geographic …