Former UBS trader Kweku Adoboli arrives at court on Thursday.<br/> <br />He is opening his defence against charges of fraud and false accounting for trades that cost the Swiss bank $2.3 billion.<br/> <br />Adoboli was arrested at UBS's London offices in the middle of the night on Sept. 15, 2011, hours after he sent an email to a back-office accountant explaining that he had booked fictitious trades to conceal losses made on "off-book" trades.<br/> <br />He has pleaded not guilty to two charges of fraud and two of false accounting.<br/> <br />Under British law, the prosecution must prove Adoboli's actions amounted to fraud and false accounting and that his intentions were dishonest.<br/> <br />The long-running trial has been a public relations headache for UBS, which has had to remain silent while Adoboli's defence team highlight evidence it says reflects poorly on the bank.
