With memories of the global horse meat scandal finally fading, consumers in China are being served with a fresh round of controversy at the deli – this one involving rat meat being passed off as mutton, among other deceptions.

Chinese officials arrested 904 people who allegedly sold adulterated and mislabeled meat products, according to a report from the country's official Xinhua News Agency. The arrests came after a three-month crackdown in which police uncovered 382 meat-related offenses and seized more than 20,000 tonnes...