Criminal evidence and procedure – Supply of drugs – Opinion and expert evidence – Admissibility High Court of Justiciary: Refusing an appeal against a sheriff's decision by an appellant who was charged with several drugs-related charges, including being concerned in the supply of controlled drugs, the sheriff having repelled the appellant's objection to the admissibility of the evidence of a police officer, a member of the drug squad, the court rejected contentions that the officer's expert evidence was not admissible on the basis that he did not have the relevant expertise and experience necessary to provide an opinion in relation to the issues in the case and because he was likely to be perceived as lacking in independence and impartiality.