Advocates of corpus linguistics claim that it can bring a level of empirical rigor to legal interpretation. But as the court's ruling in this case demonstrates, corpus linguistics can backfire and lead to conclusions based on methodology that is impossible to examine or verify.
Advocates of corpus linguistics will undoubtedly argue that misapplications of the methodology should not count against the method itself. But in a world where attorneys may increasingly seek to use corpus linguistics in a one-sided manner to convince judges that their position is correct, or where judges themselves employ corpus linguistics without the necessary transparency, the costs of this method to judicial transparency may outweigh the benefits.
A judge or attorney may abuse dictionary definitions by selecting a particular dictionary or one particular definition among alternate, plausible definitions. But these abuses can be identified and critiqued. This is not the case with incomplete corpus linguistics analysis, in which a failure to disclose search terms, coding methods, and percentages of coded results makes it impossible to evaluate the interpretive methods employed.
The court's decision in Health Freedom Defense Fund illustrates how this opaque, incomplete methodology can impact the lives of millions.
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