Questions of admissibility surrounding expert evidence have always bedevilled the judiciary. However, statutory language and rules of procedure, conscientiously interpreted and applied to the use of expert evidence, can go a long way towards achieving rectitude of decision where judgement requires knowledge not necessarily possessed by the jurists responsible for trying the case. In this remarkable work of analysis and commentary, George Cumming takes the position that the prominent international courts of Europe fail to follow their own rules of procedure in the use of expert opinion, thus potentially breaching the express right to a fair trial embodied within Article 6 (1) ECHR.