Although some of you may consider this practice excessive, food suppliers and manufacturers adhere to the policy of tracing their products because bacteria such as E. coli and Salmonella have been found in packaged foods. In addition, there have been isolated cases where dangerous allergens such as peanuts have accidentally been introduced into certain products.
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第八十九条 饲养动物，干扰他人正常生活的，处警告；警告后不改正的，或者放任动物恐吓他人的，处一千元以下罚款。
Tony Jolliffe/ BBC News