Abstract
Experimental psychologists serving as expert witnesses must consider the following question: “What ethical principles govern their statments made in expert testimony?” Two interrelated issues are involved. The first focuses upon the consideration of selectivity exercised when psychological research is described to a judge or jury. The second centers upon consideration of those principles that constitute an adequate basis for a statement made in expert testimony. These principles are explained using the literature from eyewitness testimony and cross-racial identification as descriptive instances. It was concluded that experts have the responsibility of giving the courts clear and unambiguous conceptual insights through selective explanations of all relevant findings and theoretical implications. Relevancy is defined in terms of studies that meet established standards of scientific criteria.

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