Psychological Testimony on Trial: Questions Arise About the Validity of Popular Testing Methods

Steven K. Erickson, University of Pennsylvania Law School

Abstract

Psychological tests are frequently used by forensic psychologists engaged in evaluations for family court matters. Since the recommendations that flow from such evaluations can have considerable influence on the disposition of such cases, it is crucial that any tests used by the forensic evaluator possess solid scientific reliability and validity. Unfortunately, one of the most common psychological tests used in family court matters, the infamous Rorschach inkblot test, has serious psychometric deficits that render it unreliable and invalid. This brief essay discusses these limitations and urges attorneys to vigorously challenge expert testimony based upon this flawed test.