Federal authorities began investigating Mo Hailong, 46, for conspiring to steal corn seeds from DuPont Pioneer and Monsanto after DuPont security staff noticed his suspicious activity.
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Mo was employed as director of a Chinese conglomerate that runs a corn seed subsidiary.
Mo's sister, Mo Yun, who was charged with trying to steal patented US seeds in July 2014, is married to the founder and chairman of the conglomerate.
Mo will be sentenced at a later date. As part of his plea agreement, he will not be sentenced to more than five years in prison.
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