Officials from Duskin Co, a cleaning-equipment rentals company that operates the fastfood chain Mister Donut in Japan, admitted yesterday [Monday] that they had overseen the sale of more than 13 million meat dumplings treated with a banned antioxidant. Further more, they revealed that the US parent company was involved in a ¥60m (US$0.47m) bid to cover up the scandal, by paying off a business client aware of the treatment.