Law Commons^™

The Forensic Community Can Educate Lawyers, Judges, Robert M. Sanger

Robert M. Sanger

The New Pcast Report To The President Of The United States On Forensic Science, Robert M. Sanger

Robert M. Sanger

Probability, Individualization, And Uniqueness In Forensic Science Evidence: Listening To The Academies, David H. Kaye

David Kaye

Day in and day out, criminalists testify to positive, uniquely specific identifications of fingerprints, bullets, handwriting, and other trace evidence. A committee of the National Academy of Sciences, building on the writing of academic commentators, has called for sweeping changes in the presentation and production of evidence of identification. These include some form of circumscribed and standardized testimony. But the Academy report is short on the specifics of the testimony that would be legally and professionally allowable. This essay outlines possible types of testimony that might harmonize the testimony of criminalists with the actual state of forensic science. It does …

Ultracrepidarianism In Forensic Science: The Hair Evidence Debacle, David H. Kaye

David Kaye

For over 130 years, scientific sleuths have been inspecting hairs under microscopes. Late in 2012, the FBI, the Innocence Project, and the National Association of Criminal Defense Lawyers joined forces to review thousands of microscopic hair comparisons performed by FBI examiners over several of those decades. The results have been astounding. Based on the first few hundred cases in which hairs were said to match, it appears that examiners “exceeded the limits of science” in over 90% of their reports or testimony. The disclosure of this statistic has led to charges that the FBI “faked an entire field of forensic …

From Gridlock To Groundbreaking: Realizing Reliability In Forensic Science, Jessica D. Gabel

Jessica Gabel Cino

In 2009, The National Academy of Sciences published a scathing report announcing that forensic science is broken and needs to be overhauled. Weaknesses have plagued forensic evidence for decades, and the resulting legal challenges have been hard fought but met with few victories. What we do know is a harsh truth: that faulty forensic science has contributed to the conviction of innocent people—and will continue to do so if the status quo persists.

In recent years, the reality of wrongful convictions has become mainstream through the work of the Innocence Project and other organizations. Out of the 305 DNA-based exonerations …

Defying Dna: Rethinking The Role Of The Jury In An Age Of Scientific Proof Of Innocence, Andrea L. Roth

Andrea L Roth

In 1946, public outrage erupted after a jury ordered Charlie Chaplin to support a child who, according to apparently definitive blood tests, was not his. Half a century later, juries have again defied apparently definitive evidence of innocence, finding criminal defendants guilty based on a confession or eyewitness notwithstanding exculpatory DNA test results. One might expect judges in such cases to direct an acquittal, on grounds that the evidence is legally insufficient because no rational juror could find guilt beyond a reasonable doubt. Yet few if any do. Instead, courts defer to juries when they form an actual belief in …

Will History Be Servitude?: The Nas Report On Forensic Science And The Rule Of The Judiciary, Jane Moriarty

Jane Campbell Moriarty

For several decades, the prosecution and its witnesses have maintained that despite little research and virtually no standards, they can match a fingerprint, handwriting, bullet and bullet cartridge, hair, dental imprint, footprint, tire track, or even a lip print to its unique source (collectively, “individualization evidence”). Not only can they match it, they claim, they can do so often without any error rate. In the last few decades, with the help of lawyers and academics, litigants have challenged the underlying reliability of individualization evidence. Scholars in various disciplines have written about the startling state of individualization evidence, including its lack …

Safety In Numbers?: Deciding When Dna Alone Is Enough To Convict, Andrea L. Roth

Andrea L Roth

Fueled by police reliance on offender databases and advances in crime scene recovery, a new type of prosecution has emerged in which the government's case turns on a match statistic explaining the significance of a “cold hit” between the defendant’s DNA profile and the crime-scene evidence. Such cases are unique in that the strength of the match depends on evidence that is nearly entirely quantifiable. Despite the growing number of these cases, the critical jurisprudential questions they raise about the proper role of probabilistic evidence, and courts’ routine misapprehension of match statistics, no framework currently exists – including a workable …

Safety In Numbers?: Deciding When Dna Alone Is Enough To Convict, Andrea L. Roth

Andrea L Roth

Fueled by police reliance on offender databases and advances in crime scene recovery, a new type of prosecution has emerged in which the government's case turns on a match statistic explaining the significance of a “cold hit” between the defendant’s DNA profile and the crime-scene evidence. Such cases are unique in that the strength of the match depends on evidence that is nearly entirely quantifiable. Despite the growing number of these cases, the critical jurisprudential questions they raise about the proper role of probabilistic evidence, and courts’ routine misapprehension of match statistics, no framework currently exists – including a workable …

Safety In Numbers?: Deciding When Dna Alone Is Enough To Convict, Andrea L. Roth

Andrea L Roth

Fueled by police reliance on offender databases and advances in crime scene recovery, a new type of prosecution has emerged in which the government's case turns on a match statistic explaining the significance of a “cold hit” between the defendant’s DNA profile and the crime-scene evidence. Such cases are unique in that the strength of the match depends on evidence that is nearly entirely quantifiable. Despite the growing number of these cases, the critical jurisprudential questions they raise about the proper role of probabilistic evidence, and courts’ routine misapprehension of match statistics, no framework currently exists – including a workable …

Safety In Numbers?: Deciding When Dna Alone Is Enough To Convict, Andrea L. Roth

Andrea L Roth

Fueled by police reliance on offender databases and advances in crime scene recovery, a new type of prosecution has emerged in which the government's case turns on a match statistic explaining the significance of a “cold hit” between the defendant’s DNA profile and the crime-scene evidence. Such cases are unique in that the strength of the match depends on evidence that is nearly entirely quantifiable. Despite the growing number of these cases, the critical jurisprudential questions they raise about the proper role of probabilistic evidence, and courts’ routine misapprehension of match statistics, no framework currently exists – including a workable …

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

Michael J Saks

Forensic scientists across a broad array of sub-specialties have long maintained that they can link an unknown mark (e.g., a partial fingerprint or tireprint) to a unique source. Yet no scientific basis exists for this assertion, which is sustained largely by faulty probabilistic intuition that equates infrequency with uniqueness. This article traces the origins of the individualization claim and explicates the various failed lines of evidence and argument offered in its support. We conclude with suggestions for how to improve the scientific basis of the forensic identification sciences.

Forensic Science: Grand Goals, Tragic Flaws, And Judicial Gatekeeping, Jane Campbell Moriarty

Jane Campbell Moriarty

In the last decade, a number of scientists have published articles and testified in court, explaining the ways in which they believe that some of the forensic sciences do not meet reliability standards and that laboratories make errors. The explosion of exonerations resulting from DNA technology has raised questions about the accuracy of many forensic sciences and the quality of some laboratory testing. A substantial number of these defendants can point to erroneous forensic science as a contributing cause of their wrongful convictions. In the courts, increasingly, the parties have substantial and serious disagreements about the quality of forensic science. …