genie: let's look at the latest twist in the french rogue trader jerome kerviel. stephen: he was jailed for causing almost 5 billion euros worth of losses when he worked as a citation around. he is making the case to have the charges thrown out. a police inspector who led the investigation said she is certain that management at sociÉtÉ generale knew what he was doing. the bank has denied. reporter: it was the biggest trading loss in banking history. 4.9 billion euros. the bank has insisted that the trader acted alone, making illicit bets for as much as 50 billion euros and covering them up and while admitting he exceeded his authorized trading limit, kerviel maintain his higher-ups knew about the activities. a senior police officer who live the investigation recently told the judge that he was now certain kerviel's supervisors know what he was doing. the men who worked in the bank with the management unit said he had informed senior managers in 2007, marking the e-mails with us: cross buns to alert them. when he was sentenced to five years in jail, kerviel called

his lawyer says kerviel is asking for his case to be overturned. luke brown has the details. luke: a bombshell that could break up the case to gets sharon curzio -- case gainst jerome kerviel. the lead officer from the financial crimes bureau telling a senior magistrate last month that she has serious doubts that kerviel is the sole guilty party. >> i felt like i was being manipulated by societe generale. his bosses must have known what he was doing. societe generale provided all of the witnesses. it was a pretty comfortable position. luke: they claimed was a rogue trader and nearly broke the bank with a wildly risky trades. this could undermine the foundation of the case against him. >> can you imagine for just two minutes that the bank did not know the traitorous taking positions were for more than the banks entire value? luke: after two trials, he was sentenced to three years in jail in 2012, the only convicted culprit for the losses of almost 5 billion euros suffered by societe generale. this is defended by kerviel and his defenders. >> it destroys the idea that they did