A Toolkit to Support Weight of Evidence Approaches for Food Authenticity Investigations has been published by Defra.
Applying a weight of evidence approach for food authenticity investigation is relevant in situations where screening tests which do not give a definitive answer are used, for example with non-targeted fingerprinting approaches for food authenticity testing which rely on probability-based interpretation of the data. In these situations, gathering and assessing the weight of evidence can help in drawing a conclusion on the authenticity of a sample/product.
This document provides a structured outline on how to approach a weight of evidence assessment to verify the authenticity of food and drink samples where there is no single confirmatory test result available.
It has been developed by a sub-group of Defra’s Authenticity Methods Working Group (AMWG), drawing on analytical testing, enforcement, and food industry expertise.