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The Art in the Science of DNA: A Layperson's Guide to the Subjectivity Inherent in Forensic DNA Typing


Erin Murphy


New York University School of Law

February 2, 2008

Emory Law Journal, Vol. 58, No. 489, 2008

Abstract:     
DNA typing is typically held out as the pinnacle of "good" forensic evidence, in that it exemplifies the kind of scientific rigor that first-generation techniques lack. And, without question, this praise is well-deserved. DNA typing represents a marked advance beyond the shamanistic "sciences" of the first generation. Yet the seeming corollary - that DNA typing is therefore an exercise in purely objective, indisputable science - does not hold true. This is not to suggest that DNA has no basis in objective science, or even that it is as subjective as other forensic techniques; comparing most first-generation methods to DNA typing is like comparing astrology to neuroscience. Nevertheless, not unlike neuroscience, the fact that DNA typing is scientifically grounded does not mean that there are not plenty of things that we still do not understand about it, and plenty of instances in which the best conclusions we can draw are nonetheless tentative ones. To be clear, I am not saying that DNA typing done poorly entails an exercise of subjective judgment. Rather, DNA typing - done perfectly and precisely according to protocol - still often entails making discretionary calls and choices. But just because DNA typing is not wholly objective does not mean that it is wholly indeterminate - it simply means that it may be more like meteorology than mathematics. This Article explains, in what I hope is accessible language, some of the the subjective discretion involved in forensic DNA typing.

Number of Pages in PDF File: 24

Keywords: DNA, subjectivity, forensic typing, discretion, guide

JEL Classification: K14

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Date posted: February 3, 2011  

Suggested Citation

Murphy, Erin, The Art in the Science of DNA: A Layperson's Guide to the Subjectivity Inherent in Forensic DNA Typing (February 2, 2008). Emory Law Journal, Vol. 58, No. 489, 2008. Available at SSRN: http://ssrn.com/abstract=1753906

Contact Information

Erin Elizabeth Murphy (Contact Author)
New York University School of Law ( email )
40 Washington Square South
New York, NY 10012
United States
212-998-6672 (Phone)
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