The CCTV 3. 15 party is a large-scale public welfare party jointly sponsored and broadcast by the Central Radio and Television General Station and the state government departments to safeguard consumers' rights and interests.

Among them, the vermicelli production base in Yuzhou was exposed, and the reporter learned that the "sweet potato vermicelli" and "yam vermicelli" sold here were mixed with "corn starch and cassava starch". In a humble house in Zhang Cun, Shu Tong, Yuzhou, the machine for processing vermicelli is covered with stains, and the narrow aisle is filled with bags of cassava starch. Workers mix a small amount of corn starch and cassava starch and shovel them into the machine. After several processes, vermicelli was made.

In the market, cassava starch is less than 2 yuan per catty, and sweet potato starch is sold around 4 yuan per catty. In order to save money, it is a common local production method to replace sweet potato starch with cassava starch. Sales staff told reporters that they can produce 5 tons of cassava fans every day, most of which are sold as sweet potato fans.