Full Description

1.1This is a guide for the derivation of quantitative assessments of the credibility of proposed witness testimony through the application of established statistical principles to combinations of PDD examination results, and for the utilization of such assessments in the interests of justice (The Marin Protocol).

1.2This guide describes circumstances in which proven statistical principles, applied to PDD results, can reliably quantify the trustworthiness or untrustworthiness of witness testimony, and

1.2.1Delineates requirements necessary to effect the generation and practical use of such results, including:

1.2.1.1Criteria regarding witnesses to be examined,

1.2.1.2Criteria for determining facts upon which witnesses are to be examined,

1.2.1.3Certification of examiners eligible to conduct examinations,

1.2.1.4Combinations of results which support strong inferences, and

1.2.1.5Appropriate uses to which strong inferences can be put.

1.3Courts and others responsible for adjudicating questions of fact may choose whether and when to invoke paired PDD testing.

1.3.1This guide expresses the rights and obligations of all participants in order to best serve the interests of justice when it is invoked.

1.3.2Paired PDD testing must not be invoked in any case in any jurisdiction where to do so would violate the laws of that jurisdiction.

1.3.3Adherence to these guidelines ensures that the conclusions reached will be valid.

1.4This guide is directed to the proposed testimony of witnesses in criminal, civil, administrative and family court litigation, regarding factual claims, where

1.4.1It is unlikely that the witnesses could be honestly mistaken, and

1.4.2The facts in dispute are such that the case may hinge on whom the trier of fact believes; whenever,

1.4.3Witnesses on opposite sides of a case offer contradictory testimony.

1.4.4Two or more witnesses testifying for one side offer mutually corroborating testimony.

1.5This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.