According to China's Food Safety Law and related regulations, American ginseng and black-bone chicken are legal ingredients, which are widely sold and used in the market. It is legal for Shaxian snack bar to use these ingredients to make black-bone chicken soup, as long as it meets the food safety and hygiene requirements and is inspected and certified by relevant departments. Therefore, it is not illegal to snack American ginseng and black-bone chicken soup in Shaxian.