Former trader Hayes ignored 2009 warning, Libor trial hears

It was just people doing their jobs," Hayes said     Hayes is the first person to face trial by jury over allegations of conspiring to rig Libor rates, a scandal which has cost banks billions of dollars in fines from regulators.     Conspiracy to defraud can carry a 10 year jail sentence.     Hayes traded in yen-denominated derivatives tied to Libor.