With the revelations last week that Fujiya Co. had been using expired ingredients in its products, concerns about food safety are growing. Below are answers to some questions about sanitation rules and the Fujiya scandal.

What are the government's rules on expiration dates for food?

Under the Food Sanitation Law, processed food must display one of two types of expiration dates -- "shohi kigen" (consume-by date) or "shomi kigen" (best-by date).