(From the Decision of the High Court of Zanzibar at Zanzibar, Mbarouk, J., dated 13 June 2005, in Criminal Appeal number 24 of 2004) Evidence - Witness — Expert witness — Whether the opinion of an expert witness can override credible and trustworthy evidence of an eye witness. Evidence - Medical evidence - Adverse medical evidence — Whether conclusive as against the evidence of a credible eye witness.