A baker cleared of raping a mentally retarded woman after his trial was abandoned at the last minute was yesterday awarded costs. The prosecution offered no evidence against Chau Yeung-yiu, 40, on August 13 and said the alleged victim would be too traumatised to testify at the High Court. Police said the 20-year-old girl, who has a mental age of six, could not have given sworn evidence because she did not understand what an oath or affirmation was. Deputy Judge Wayne Wilson queried why the prosecution left the charge hanging over Mr Chau's head for 17 months before deciding to drop the case. Mr Chau had pleaded not guilty to raping the woman at his San Po Kong office on March 16 last year. The costs awarded to Mr Chau are still to be assessed.