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Evidence Commons

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Law Enforcement and Corrections

Evidence

Faculty Working Papers

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Full-Text Articles in Evidence

Blaming As A Social Process: The Influence Of Character And Moral Emotion On Blame, Janice Nadler Jan 2012

Blaming As A Social Process: The Influence Of Character And Moral Emotion On Blame, Janice Nadler

Faculty Working Papers

For the most part, the law eschews the role of moral character in legal blame. But when we observe an actor who causes harm, legal and psychological blame processes are in tension. Procedures for legal blame assume an assessment of the actor's mental state, and ultimately of responsibility, that is independent of the moral character of the actor. In this paper, I present experimental evidence to suggest that perceptions of intent, foreseeability, and possibly causation can be colored by independent reasons for thinking the actor is a bad person, and are mediated by the experience of negative moral emotion. Our …


The Need For A Research Culture In The Forensic Sciences, Jonathan Koehler, Jennifer L. Mnookin, Simon A. Cole, Barry A.J. Fisher, Itiel E. Dror, Max Houck, Kieth Inman, David H. Kaye, Glenn Langenburg, D. Michel Risinger, Norah Rudin, Jay Siegel Jan 2011

The Need For A Research Culture In The Forensic Sciences, Jonathan Koehler, Jennifer L. Mnookin, Simon A. Cole, Barry A.J. Fisher, Itiel E. Dror, Max Houck, Kieth Inman, David H. Kaye, Glenn Langenburg, D. Michel Risinger, Norah Rudin, Jay Siegel

Faculty Working Papers

The methods, techniques, and reliability of the forensic sciences in general, and the pattern identification disciplines in particular, have faced significant scrutiny in recent years. Critics have attacked the scientific basis for the assumptions and claims made by forensic scientists both in and out of the courtroom. Defenders have emphasized courts' long-standing acceptance of forensic science evidence, the relative dearth of known errors, and the skill and experience of practitioners. This Article reflects an effort made by a diverse group of participants in these debates, including law professors, academics from several disciplines, and practicing forensic scientists, to find and explore …


If The Shoe Fits They Might Acquit: The Value Of Forensic Science Testimony, Jonathan Koehler Jan 2011

If The Shoe Fits They Might Acquit: The Value Of Forensic Science Testimony, Jonathan Koehler

Faculty Working Papers

The probative value of forensic science evidence (such as a shoeprint) varies widely depending on how the evidence and hypothesis of interest is characterized. This paper uses a likelihood ratio (LR) approach to identify the probative value of forensic science evidence. It argues that the "evidence" component should be characterized as a "reported match," and that the hypothesis component should be characterized as "the matching person or object is the source of the crime scene sample." This characterization of the LR forces examiners to incorporate risks from sample mix-ups and examiner error into their match statistics. But how will legal …


Proficiency Tests To Estimate Error Rates In The Forensic Sciences, Jonathan Koehler Jan 2011

Proficiency Tests To Estimate Error Rates In The Forensic Sciences, Jonathan Koehler

Faculty Working Papers

A proficiency test is an assessment of the performance of laboratory personnel using samples whose sources are known to the proficiency test administrator but unknown to the examinee. Proficiency tests can help identify reasonable first pass estimates for the rates at which various types of errors occur. It is crucial to obtain error rate estimates because the reliability and probative value of forensic science evidence is inextricably linked to the rates at which examiners make errors. Without such information, legal decision makers have no scientifically meaningful way of thinking about the risk of false identification and false non-identification associated with …