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No Need to Toss a Coin: Conflicting Scientific Expert Testimonies and Intellectual Due Process


Gustavo Ribeiro


Harvard Law School

May 27, 2013

Law, Probability & Risk, Forthcoming

Abstract:     
This paper focuses on the question of how decision makers with no relevant scientific background can (if at all) legitimately evaluate conflicting scientific expert testimonies and determine their relative reliability. Skeptics argue that non-experts can never reach justifiable conclusions regarding the merits of conflicting expert testimonies because they lack the fundamental epistemic capacity to make such judgment calls. In this paper, I draw on works on epistemology, philosophy of practical reasoning, philosophy of science, science and technology studies, and legal theory in order to scrutinize recent proposals to solve the problem of conflicting scientific expert testimonies. Addressing this question is of ultimate importance due to the idea that immanent in the idea of rule-of-law there is an intellectual due process norm, which articulates that epistemically arbitrary legal decisions are also not legally justified.

This paper is divided into two parts. In Part I, I describe the basic philosophical inquiries underlying the debate about expert testimony. In particular, I first elaborate on the philosophy of testimony and its epistemic justifications, then move to the idea of epistemic deference, and finish with philosophical accounts of expertise. Part II presents the problem of conflicting scientific expert testimonies and analyzes recent attempts to solve it as formulated by Ward Jones, Alvin Goldman, and Scott Brewer. I argue that there is no single criterion (or set of criteria) upon which the non-expert could rely in order to make a rationally justified decision in each and every case in which he faces conflicting scientific expert testimonies. The alternative view here defended is to stop looking for an epistemic panacea and accept the idea that testimonial reliability operates differently within different kinds of testimony – and differently within the same kind of testimony at different times.

Number of Pages in PDF File: 48

Keywords: Evidence, Testimony, Legal Reasoning, Epistemology

JEL Classification: K00

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Date posted: August 14, 2012 ; Last revised: May 28, 2013

Suggested Citation

Ribeiro, Gustavo, No Need to Toss a Coin: Conflicting Scientific Expert Testimonies and Intellectual Due Process (May 27, 2013). Law, Probability & Risk, Forthcoming. Available at SSRN: http://ssrn.com/abstract=2128915 or http://dx.doi.org/10.2139/ssrn.2128915

Contact Information

Gustavo Ribeiro (Contact Author)
Harvard Law School ( email )
1875 Cambridge Street
Cambridge, MA 02138
United States
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