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D. Michael Risinger, Mark P. Denbeaux, Michael J. Saks, Exorcism of Ignorance as a Proxy for Rational Knowledge: The Lessons of Handwriting Identification "Expertise", University of Pennsylvania Law Review, Vol. 137, No. 3 (Jan., 1989), pp. 731-792
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Risinger et al. (1989) studied this question.
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