See here.  There are too many scary quotes in this Times article to list, but here’s a sample:

In recent weeks, China’s news media have reported sales of pork adulterated with the drug clenbuterol, which can cause heart palpitations; pork sold as beef after it was soaked in borax, a detergent additive; rice contaminated with cadmium, a heavy metal discharged by smelters; arsenic-laced soy sauce; popcorn and mushrooms treated with fluorescent bleach; bean sprouts tainted with an animal antibiotic; and wine diluted with sugared water and chemicals.