Rogue trader Jerome Kerviel faces five years in prison Prosecutor Dominique Gaillardot contends Kerviel took advantage of faults in his employer's trading system to hide risky actions. The initial 2010 sentence for a breach of trust, forgery and entering false data gave Kerviel a three-year prison sentence and ordered him to pay €4.9bn (£3.9bn) - the amount Societe Generale said it cost to unwind the deals he had done. Mr Gaillardot suggested today the possibility of an "eventual evolution" regarding those damages, but that decision is ultimately up to the court. Kerviel, 35, claims the bank was aware of his bets. Gaillardot says Kerviel simply knew how to "escape controls." The trial ends tomorrow, with the verdict due at a later date.