SEOUL, March 27 (Yonhap) -- Those caught producing and distributing adulterated food could face a minimum of three years in prison as part of the government's effort to root out problems caused by substandard food that threatens public safety, the Prime Minister's Office (PMO) said Wednesday. It is one of the comprehensive countermeasures the government devised to guarantee the safety of foodstuff in line with President Park Geun-hye's pledge to eradicate the country's four major "social ills" of school and sexual violence, home-wrecking crime and substandard food.