Clarence Darrow, the American writer and lawyer, once said that everyone was a potential murderer, and that although he himself had never killed anyone, he frequently got great satisfaction in reading the obituary notices. Mr Darrow perhaps goes further than most of us - but the fact remains that we are all intrigued by a murder trial. Maybe subconsciously we put ourselves in the position of the accused - and the more normal the accused person is, the greater our interest...