17. Corroboration, the ‘Turnbull Guidelines’, and Opinion Evidence

This chapter considers the nature of corroborative evidence; the situations where corroborative evidence is required as a matter of law; the situations where a corroboration warning might be given as a matter of judicial discretion; and the application of the ‘Turnbull guidelines’ in cases where eye-witness identification is disputed. It also explains the rules relating to opinion evidence and to expert opinion evidence in particular.