Abstract
A content analysis is reported on evidence introduced in deceptive advertising cases, evidence that is erroneous, meaning rejected as unable to establish the factual finding it was introduced to support. Further, this evidence is avoidably erroneous, meaning the invalidity and consequent rejection were predictable in advance on the basis of the professional knowledge of lawyers or researchers. The result is discussed as happening because of the nature of legal action and because of the interaction of lawyers and researchers. Implications of such avoidably erroneous evidence are discussed and suggestions are made for ways to eliminate them.
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