accomplice is admissible but where he is a prosecution witness, the judge must warn himself that although he may convict on his evidence, it is dangerous to do so unless it is corroborated. There is no magic formula for warning. Warning may advance justice but the effect of failure to warn appears to tilt to the contrary and therefore calls for a review of the law relating to corroboration. SUMMARY Corroboration is evidence that differs from but strengthens or reinforces other evidence (especially that which needs support). It is a confirmatory or supporting proof of a matter on which evidence of the same fact has already been or will be given. It may be required in law or in practice. Admission and confession among others are forms of corroboration, but lying may not be. You should be careful to dichotomise between “lying” or “mistaking” and whether the lie or mistake pertains to participation in the crime charged or his presence at the scene of crime. Read some of the cases referred to in the text.